and gsp_ids filter to read forecast + tests

[peterdudfield]

Pull Request

Description

Need for https://github.com/openclimatefix/uk-pv-national-gsp-api/issues/270

Fixes #

How Has This Been Tested?

CI tests + new test

• [x] Yes

Checklist:

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

[codecov[bot]]

Codecov Report

Merging #242 (b0dc621) into main (e532f93) will increase coverage by 0.00%. Report is 1 commits behind head on main. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   95.24%   95.25%           
=======================================
  Files          27       27           
  Lines        1726     1727    +1     
=======================================
+ Hits         1644     1645    +1     
  Misses         82       82           

Files Changed	Coverage Δ
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/read/read.py	98.06% <100.00%> (+<0.01%)	:arrow_up:

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