Add select on read for MWA correlator FITS files

[bhazelton]

Description

Add support for select on read to MWA correlator FITS files to save memory and time. This adds support for most but not all select keywords. The implementation is a bit complicated because of the structure of MWA correlator FITS files, which is also different between the files written by the legacy correlator and MWAX.

Edit: we have benchmarking now and the benchmarks didn't slow down significantly
I am a bit concerned that some of these changes may have slowed down the reading when not selecting on read. I think this needs to be tested/profiled more, would love some help on that front.

I also refactored some selection code for the baseline-time axis and the frequency axis into functions for better code reuse, leading to changes in UVData.select and UVCal.select. And I improved the way the history string is built up.

Motivation and Context

closes #1386

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation change (documentation changes only)
• Version change
• Build or continuous integration change

Checklist:

• I have read the contribution guide.
• My code follows the code style of this project.

New feature checklist:

• I have added or updated the docstrings associated with my feature using the numpy docstring format.
• I have updated the tutorial to highlight my new feature (if appropriate).
• I have added tests to cover my new feature.
• All new and existing tests pass.
• I have updated the CHANGELOG.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.92%. Comparing base (72dd3bc) to head (0305ab5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1458      +/-   ##
==========================================
- Coverage   99.92%   99.92%   -0.01%     
==========================================
  Files          61       62       +1     
  Lines       21337    21327      -10     
==========================================
- Hits        21322    21312      -10     
  Misses         15       15              

Flag	Coverage Δ
	99.92% <100.00%> (-0.01%)	⬇️

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