Access shortcut funcs through extensions

[jesseleite]

Description

This PR allows us to keymap shortcut through the extensions object, rather than having to require a different object, which is just syntactical sugar and looks cleaner. I think the whole extensions.live_grep_args scoping allows for this nicely. Also, this is backwards compatible, people can still map to the old shortcuts module directly too.

Before

require("telescope").extensions.live_grep_args.live_grep_args()
require("telescope-live-grep-args.shortcuts").grep_visual_selection()
require("telescope-live-grep-args.shortcuts").grep_word_under_cursor()

After

require("telescope").extensions.live_grep_args.live_grep_args()
require("telescope").extensions.live_grep_args.shortcuts.grep_visual_selection()
require("telescope").extensions.live_grep_args.shortcuts.grep_word_under_cursor()

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Run or keymap shortcuts through extensions object:
  • ie) require("telescope").extensions.live_grep_args.shortcuts.grep_visual_selection()

Configuration:

• Neovim version (nvim --version): 0.11.2
• Operating system and version: MacOS 15.5

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)