Fixing an issue with UVData objects being incorrectly added

[kartographer]

Fixes a bug with UVData.__add__ when objects are sorted differently.

Description

• Made a change to UVData.__add__ that checks for the ordering of records along time-baseline, polarization, and frequency when two UVData objects have "overlap" in these domains. If there is overlap, but the ordering of the data is different, the new code will reorder the (meta-)data of one of the objects so that data are concatenated as expected.

Motivation and Context

Fixes a nasty bug were data could be concatenated incorrectly when the sorting order is different (e.g., #1102).

Closes #1102.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

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

Bug fix checklist:

• My fix includes a new test that breaks as a result of the bug (if possible).
• All new and existing tests pass.
• I have updated the CHANGELOG.

[codecov]

Codecov Report

Merging #1105 (e6ceacd) into main (fa00f52) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1105   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          31       31           
  Lines       14400    14422   +22     
=======================================
+ Hits        14374    14396   +22     
  Misses         26       26           

Impacted Files	Coverage Δ
pyuvdata/uvdata/uvdata.py	99.93% <100.00%> (+<0.01%)	⬆️

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[bhazelton]

Looks good. Thanks for the quick fix @kartographer!