Port fixes from: sarpy#508, sarpy#530, sarpy#538, sarpy#561; fix docs warning #2
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Description
This PR ports 4 SARPy bugfixes relevant to SARkit's NITF handling:
In addition, a warning related to a mislabeled docstring section has been addressed.
Aside from some import path changing and ruff-formatting, the only novel difference from the original SARPy source was the omission of a unit-test for the changes related to ngageoint/sarpy#561. This is because the unittest introduced with the fix in SARPy relies on code that doesn't exist in SARPy2 and I couldn't think of an easy way to introduce a new test that wasn't brittle. I propose it is still better to bring over the code changes for commmonality with SARPy and that when legends/DEDs are added to SIDD I/O the code paths will be exercised.