Merge #711

711: Rename FnScopes and move them below the expr module r=matklad a=flodiebold

Extracted from #693 to reduce the diff and make rebasing easier for me :wink: 

The scopes belong to a body, which could be that of a function, but also a constant, static or array size. So this moves them to a submodule of `expr`.

Also move the `expr_scopes` query from `query_definitions` to that module.

Co-authored-by: Florian Diebold <[email protected]>

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