comptime-resolving strategy to get include paths for import

[matu3ba]

This is required for package path resolving as discussed on discord.
Also, I think this is required to resolve OptionsStep (see for an usage example build_options inside src/), if those is used as import path (ie for the package).

ziglang/zig#3372 is much more complex
ziglang/zig#9973 is way simpler, but would need more handling of comptime generated import paths.

[matu3ba]

Funny enough, I am working on resolving packages now for file reduction.
The info is also used by Autodoc. The plugin is extremely useful and relative simple with the AST info.
For some reason zls is still failing to jump to the tag source and many other things, which is annoying.

I used

fd '.*.zig' src >> files
fd '.*.zig' lib/std >> files
FILES=$(cat files)
ztags $FILES