feat(logger): Add a log module

Currently the plugin uses vim.notify for almost all logging and can get
quite noisy. Many neovim systems and plugins log to files in
$XDG_STATE_DIR. This introduces a logging module and logs to a default
file. There is also some bookkeeping stuff in here too.

- Add `config.log`
- Default log file is `$XDG_STATE_DIR/nvim/eca.log`
- Default display mode is a buffer, can also display in a popup
- Default log level is vim.log.levels.INFO
- Default max file size before warning is 10MB
- Remove `config.debug`
- Create `Logger` module. Has the regular logging functions as well as
  `Logger.notify` for displaying a notification via `vim.notify`
- Add subcommands to EcaLogs ("show", "log_path", "clear", "stats"),
  `EcaLogs` called with no arguments runs `EcaLogs show`
- Replace calls to Utils logging functions with Logger
- Fix the github action to run the tests

Author: tomgeorge

.github/workflows/test.yml

@@ -17,9 +17,9 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Install Neovim
-      uses: rhymond/setup-neovim@v1
+      uses: rhysd/action-setup-vim@v1
       with:
-        neovim-version: ${{ matrix.neovim_version }}
+        neovim: true
 
     - name: Run tests
-      run: make test
+      run: make test