masking and dataset list

[Mikejmnez]

This PR adresses issues #341 and #342 by:

• Sets mask.compute() explicitly .
• Includes ECCO on the website's dataset list.

[codecov[bot]]

Codecov Report

Merging #343 (0944f60) into main (6fa4313) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #343   +/-   ##
=======================================
  Coverage   94.75%   94.75%           
=======================================
  Files           9        9           
  Lines        3944     3944           
  Branches      859      859           
=======================================
  Hits         3737     3737           
  Misses        131      131           
  Partials       76       76           

Flag	Coverage Δ
unittests	94.75% <100.00%> (ø)

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Impacted Files	Coverage Δ
oceanspy/subsample.py	97.71% <100.00%> (ø)

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