Add support for ECMWF

[jacobbieker]

Pull Request

Description

This PR adds support for opening the ECMWF Zarrs generated by the NWP consumer.

Fixes #223

How Has This Been Tested?

Unit 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 #228 (7cb17b3) into main (13fff0e) will decrease coverage by 2.78%. Report is 3 commits behind head on main. The diff coverage is 22.22%.

@@            Coverage Diff             @@
##             main     #228      +/-   ##
==========================================
- Coverage   82.50%   79.73%   -2.78%     
==========================================
  Files         125      126       +1     
  Lines        5402     5507     +105     
==========================================
- Hits         4457     4391      -66     
- Misses        945     1116     +171     

Files	Coverage Δ
ocf_datapipes/load/nwp/nwp.py	97.43% <100.00%> (+0.21%)	:arrow_up:
ocf_datapipes/load/nwp/providers/ecmwf.py	94.11% <94.11%> (ø)
ocf_datapipes/training/pseudo_irradience.py	16.41% <11.27%> (-58.59%)	:arrow_down:

... and 5 files with indirect coverage changes

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