Issue/624 pv types

[peterdudfield]

Pull Request

Description

Make sure pv dtypes are float32 and int32

Fix '_index' for all date types to be int32 too

Fixes #624

How Has This Been Tested?

• normal unittests

• added checks in tests for dtype

• Yes

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #641 (c3d5bc7) into main (9bf8cdd) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #641   +/-   ##
=======================================
  Coverage   93.14%   93.15%           
=======================================
  Files          45       45           
  Lines        3049     3052    +3     
=======================================
+ Hits         2840     2843    +3     
  Misses        209      209           

Impacted Files	Coverage Δ
...wcasting_dataset/data_sources/pv/pv_data_source.py	97.54% <100.00%> (+0.01%)	⬆️
nowcasting_dataset/dataset/xr_utils.py	98.55% <100.00%> (+0.04%)	⬆️

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