feat(lvim): add completion spec

[Arshjeet2003]

This PR adds completion spec for lvim (lunar vim). Same as nvim (neovim). Closes #1925

Screen.Recording.2024-10-03.at.3.08.28.PM.mov

[withfig-bot]

Overview

src/lvim.ts:

Info:

[withfig-bot]

Hello @Arshjeet2003,
thank you very much for creating a Pull Request!
Here is a small checklist to get this PR merged as quickly as possible:

• Do all subcommands / options which take arguments include the args property (args: {})?
• Are all options modular? E.g. -a -u -x instead of -aux
• Have all other checks passed?

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[grant0417]

LGTM, thanks!