Integrate type annotations inline into PyJapc

A substantial change to remove the _japc.pyi and replace it with inline type annotations (plus a separate typing pyi file for common definitions).

There were one or two cases where the type annotations weren't fully correct in _japc.pyi. I have fixed the ones that triggered errors with mypy. I do not intend to correct the inherited (and incorrect) callback annotations in this MR.

assigned to @pelson

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• 782bacce - Type annotate the most important PyJapc methods.

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• 7bbe3ca8 - Further type checking of internal methods

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• bf6557ea - Review of changes, and get the tests passing

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• 4639958e - Review of changes, and get the tests passing
• 1ca8c848 - Fix failing test when testing against master of JPype

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• 1f4c13d5 - Fix failing test when testing against master of JPype

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• 061dc24f - Fix failing test when testing against master of JPype

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