Make imports work with current and future pyuvdata, fix compatibility with numpy 2.0

[bhazelton]

Description

Fix some imports for pyuvdata v3 and fix compatibility with numpy 2.0

Motivation and Context

Checklists:

Bug Fix Checklist:

• I have read the contribution guide.
• My code follows the code style of this project.
• My fix includes a new test that breaks as a result of the bug (if possible).
• My change includes a breaking change
  • My change includes backwards compatibility and deprecation warnings (if possible).
• I have updated the CHANGELOG.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (914e399) to head (dbfc8ad).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #253   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines         2129      2131    +2     
  Branches       608       608           
=========================================
+ Hits          2129      2131    +2     

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[bhazelton]

The pyuvsim tests are failing because the fix for numpy 2.0 isn't into pyuvsim yet (it's in a PR). This has to be merged and we have to do a release to enable tests to pass on pyuvsim.

[jpober]

There are two coverage warnings in skymodel.py, so I'll approve but not take any steps to merge.

[bhazelton]

I think those warnings are out of date. I just checked on my machine and those lines are definitely hit by tests and the actual codecov CI passed, so I'm going to merge.