Additional grid files and removing (for the day) access to velocity data.

[Mikejmnez]

Closes #323 (grid variables XU, XV, YU, YV are now available in the grid file). I checked having these grid variables pre-computed significantly speeds up the cutout function when transforming (lazily) the dataset.

This PR also removes the velocity fields from the intake catalog. This is only temporary. I am combining all the zarr stores (within each single filedb volume) into a single one (see issue #324) . This is going to take the rest of the day. The final destination where all the data (within a single filedb node) will be stored will be where currently the velocity data lives. For that, and to avoid issues when reading LLC4320 data today, I am removing this entry (velocities) from the catalog.

Once the data has been written into a single zarr store, I will create another PR where I restore the entry associated with the velocities. In that PR (later today) all data will be in a single zarr store.

[codecov[bot]]

Codecov Report

Merging #326 (b26a8ec) into main (6bb27b6) will decrease coverage by 0.05%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
- Coverage   94.66%   94.62%   -0.05%     
==========================================
  Files           9        9              
  Lines        3939     3942       +3     
  Branches      856      857       +1     
==========================================
+ Hits         3729     3730       +1     
- Misses        134      135       +1     
- Partials       76       77       +1     

Flag	Coverage Δ
unittests	94.62% <60.00%> (-0.05%)	:arrow_down:

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Impacted Files	Coverage Δ
oceanspy/subsample.py	97.70% <50.00%> (-0.35%)	:arrow_down:
oceanspy/llc_rearrange.py	82.67% <100.00%> (ø)

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