yomaha and andro datasets

[philippemiron]

Resolves #319

• working implementation
• look at ANDRO and see if this could be combined here or should just be another datasets
• YoMaHa: include WMO id, DAC, and argo type (3 "traj" variables)
• clean up code
• add docstring and references
• rename variables
• add attributes
• wrap in clouddrift.datasets
• add tests

[philippemiron]

Not sure what the strategy could be to test those datasets since it involved downloading a ~300-400Mb ASCII file.

[milancurcic]

We test for GLAD which involves a ~150MB download and it takes a few seconds in CI. So it may be OK to try doing the same here and see how it goes. I don't know for certain but I expect that frequent file downloads in CI are cached in their local CDN.

[selipot]

Looks good to me! We need example notebooks!