Add generated engine docs and types for Lua Language Server

[rhys-vdw]

Work done

Adds first draft of types generated from beyond-all-reason/spring#1775.

Not intended to be merged yet, but it's here if anyone wants to try it. Refer to the above issue for more context.

Test steps

• Enable lua language server in your IDE.
• Check out the branch and check out the editor experience.

[badosu]

I'd suggest making library a submodule of the luadocs archive inside the engine repo

[rhys-vdw]

I'd suggest making library a submodule of the luadocs archive inside the engine repo

That's the plan :-)