[Feat] `selene` linter support

# Motivation

I have been using [selene](https://github.com/Kampfkarren/selene) in my projects lately and I think is a more strict linter in some cases, showing more `errors` or `warnings` to catch what `luacheck` do not.

- [Selene documentation](https://kampfkarren.github.io/selene/selene.html).

## Example config

In the root project.

`selene.toml`
```toml
std="neovim"

exclude = [
  "lua/plenary/profile/lua_profiler.lua",
  "lua/plenary/profile/memory_profiler.lua",
  "lua/plenary/profile/p.lua", # token `goto` detected as `parse_error`
  "lua/plenary/async_lib/*.lua",
]

[rules]
global_usage = "warn"
deprecated = "warn" # If change for `allow` it will rely in `lua_ls` diagnostics alone
multiple_statements = "warn"
incorrect_standard_library_use = "allow" # This is for cases like `string.format`, `package.config`, etc.
mixed_table = "allow"
unused_variable = "warn"
undefined_variable = "warn"
```

`neovim.yml`
```yaml
---
base: lua51

globals:
  _:
    any: true
  a:
    any: true
  jit:
    any: true
  bit:
    any: true
  vim:
    any: true
  assert:
    args:
      - type: bool
      - type: string
        required: false
  after_each:
    args:
      - type: function
  before_each:
    args:
      - type: function
  describe:
    args:
      - type: string
      - type: function
  it:
    args:
      - type: string
      - type: function
```

With these two files in the root of the project, `selene --display-style quiet lua/plenary --allow-warnings` results in the following.

```bash
lua/plenary/async/api.lua:4:22: warning[unused_variable]: t is defined, but never used
lua/plenary/bit.lua:136:21: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:176:22: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:179:22: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:182:22: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:226:28: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:227:28: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:228:28: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:252:27: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/bit.lua:269:27: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/async/tests.lua:14:3: warning[undefined_variable]: `pending` is not defined
lua/plenary/busted.lua:5:26: warning[unused_variable]: element is defined, but never used
lua/plenary/busted.lua:13:19: error[mismatched_arg_count]: this function takes 1 argument but 2 arguments were supplied
lua/plenary/busted.lua:74:41: warning[shadowing]: shadowing variable `msg`
lua/plenary/busted.lua:201:30: warning[unused_variable]: func is defined, but never used
lua/plenary/busted.lua:211:1: warning[unscoped_variables]: `pending` is not declared locally, and will be available in every scope
lua/plenary/busted.lua:211:1: warning[unused_variable]: pending is defined, but never used
lua/plenary/busted.lua:214:1: warning[unscoped_variables]: `clear` is not declared locally, and will be available in every scope
lua/plenary/busted.lua:214:1: warning[unused_variable]: clear is defined, but never used
lua/plenary/profile.lua:16:24: warning[multiple_statements]: only one statement per line is allowed
lua/plenary/run.lua:5:55: warning[unused_variable]: opts is defined, but never used
Results:
1 errors
20 warnings
0 parse errors
```

https://github.com/nvim-lua/plenary.nvim/blob/08e301982b9a057110ede7a735dd1b5285eb341f/lua/plenary/busted.lua#L1-L18

> [!note]
> The error shown is because in `lua/plenary/busted.lua` we are using the **function** `dirname` with 1 argument.
>
> But in the line `13`, `dirname(debug.getinfo(1, "Sl").source, ":h")` is using 2. Unlike in line `18`, `dirname(info.source)` is just using one as the declaration for `local dirname = function(p)` indicates.

If we fix that error, `dirname(debug.getinfo(1, "Sl").source, ":h")` -> `dirname(debug.getinfo(1, "Sl").source)`. The command for `selene` with the `--allow-warnings` flag will result in a `success` exit code when linting.

## Integrations

For the `CI` process it will be easy.

- Extending the `Makefile` to include:
  - `make lint-selene`: `selene --display-style quiet lua/plenary --allow-warnings`
- Adding a `selene` job to `workflows`:

```yaml
  selene:
    name: Selene
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout sources
        uses: actions/checkout@v2

      - name: Run selene
        uses: NTBBloodbath/selene-action@v1.0.0
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          args: --display-style quiet lua/plenary --allow-warnings
```

> [!note]
> More about `selene` action [here](https://github.com/NTBBloodbath/selene-action?tab=readme-ov-file#selene-github-action)

	local dirname = function(p)
	return vim.fn.fnamemodify(p, ":h")
	end

	local function get_trace(element, level, msg)
	local function trimTrace(info)
	local index = info.traceback:find "\n%s*%[C]"
	info.traceback = info.traceback:sub(1, index)
	return info
	end
	level = level or 3

	local thisdir = dirname(debug.getinfo(1, "Sl").source, ":h")
	local info = debug.getinfo(level, "Sl")
	while
	info.what == "C"
	or info.short_src:match "luassert[/\\].*%.lua$"
	or (info.source:sub(1, 1) == "@" and thisdir == dirname(info.source))

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[Feat] `selene` linter support #579

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[Feat] selene linter support #579

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[Feat] `selene` linter support #579