lib.importApply: init (#230588)

* lib.modules.importApply: init

Brings variables from rich scopes to modules defined in separate files.

A helper for functions in files that return a module.

* lib.modules.importApply: Edit doc

Generally improve the quality. Notes:

- Not rendered to the manual yet, so probably the syntax could be
  improved, but I have no way to test this now.

- The docs use `arg` vs `staticArg` in the code. This is intentional,
  because the doc is pretty clear about the role of `arg` whereas
  the code exists in a context where ambiguities are more harmful.

* Format

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