more typechecking

[dimbleby]

Experimenting with the effect of putting a py.typed in poetry-core, so that types from poetry-core count for something over here.

That generates lots and lots of new errors, I've picked off a fairly random selection of them here until I got bored.

[dimbleby]

(errors reported in #5476 would have been revealed by the typechecking, if poetry-core had a py.typed)

[dimbleby]

This MR's project of cleaning up errors revealed by having a py.typed in poetry-core is complete as of the latest commit, with a couple of exceptions:

• obviously there are still quite a few files excluded from mypy checking altogether, I haven't made a dent in those
• I still have these two errors:

src/poetry/repositories/link_sources/base.py:82: error: Argument 1 to "Package" has incompatible type "Optional[str]"; expected "str"  [arg-type]
src/poetry/repositories/link_sources/base.py:82: error: Argument 2 to "Package" has incompatible type "Optional[Version]"; expected "Union[str, Version]"  [arg-type]

which is #5476, more or less. cc @abn.

(recent commits have mostly been finding a way around the typechecking when dealing with tomlkit, whose types seem to be... hard to use)

[dimbleby]

Although I now see that because pre-commit runs in an incomplete environment - #5279 - it doesn't see all the errors that it should and therefore insists that I a making a redundant cast. Hmm.

[github-actions]

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