Added `PyRefMap` and `PyRefMapMut` for borrowing data nested within a `PyRef`/`PyRefMut`#4203

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JRRudy1 wants to merge 7 commits intoPyO3:mainfrom JRRudy1:pyref-map

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Commits on May 23, 2024

Implemented first draft of PyRefMap and PyRefMapMut.
JRRudy1
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Implemented second draft of PyRefMap and PyRefMapMut. These structs are now opaque, w.r.t. the owner, including both the PyRef flavor and the underlying pyclass.
JRRudy1
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Implemented third draft of PyRefMap and PyRefMapMut. The PyRefMap struct is now opaque w.r.t. only the PyRef flavor and the Frozen-ness of the pyclass so that the struct can use either `P…
JRRudy1
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Implemented fourth draft of PyRefMap and PyRefMapMut. Both types are now aliases for a single struct PyRefMapBase that has a Mut: Boolean generic parameter indicating whether it supports `D…
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Implemented fifth draft of PyRefMap and PyRefMapMut. The is similar to the 4th draft, with a single base struct being reused for both PyRefMap and PyRefMapMut, but the pyclass type is now o…
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Cleanup and documentation.
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Merge branch 'PyO3:main' into pyref-map
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