feat: adding Lua plugin support

[SirZenith]

This is Lua plugin support implementation as mentioned in #2616, detail about implementation is written in LUA_DEV.md.

LuaLS meta definition for bindings and module can be found in https://github.com/SirZenith/lf-luals-meta.

[CatsDeservePets]

• refs: UI configuration via Lua scripts #2531

This PR currently adds 10,572 lines. When running wc -l *go inside lf's repo, I get a total line count of 14,039. This makes me question whether it was written by AI.

Realistically, neither @joelim-work nor I can review such a large PR, let alone maintain it.

I am not against the feature itself, I am just not really sure if this is the way.

[SirZenith]

No, this is not AI generated. It took me half a month to finish.

Most of its size comes from Lua bindings in lua_binding_*.go and lua_module_*.go, they are simple but take lines of code, basically just exposing existing methods to Lua.

[SirZenith]

Current implementation has a problem. Some bindings call Lua function themself, and this might case dead lock by acquiring Lua state's mutex, which is already occupied by caller of binding function.

And I haven't came up with a good solution yet.