Add AVISO metadata and tests

[taimoorsohail]

What changed

• added a new AVISO DataWrangling module with monthly and daily surface metadata
• generalized the CopernicusMarine extension so both GLORYS and AVISO can share the downloader path
• exported the AVISO dataset types from DataWrangling and NumericalEarth
• added AVISO download coverage and a surface-field metadata sanity test
• updated the GLORYS padding test to the new generic Copernicus helper signature

Why

This wires AVISO into the existing metadata-driven download and set! workflow so SSH-related fields can be handled the same way as the other supported datasets.

Impact

Users can now construct AVISO metadata for fields like :free_surface, :ssh, :sea_level_anomaly, :ugos, and :vgos, and the test suite has coverage for both downloading and basic field usage.

Validation

• parsed the touched Julia source and test files with Meta.parseall
• did not run the local test suite per repo instructions in AGENTS.md

[codecov]

Codecov Report

❌ Patch coverage is 16.85393% with 74 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/DataWrangling/AVISO/AVISO.jl	3.63%	53 Missing ⚠️
ext/NumericalEarthCopernicusMarineExt.jl	38.23%	21 Missing ⚠️

📢 Thoughts on this report? Let us know!

[navidcy]

I thought AVISO was renamed to "satellite altimetry observational dataset by the Copernicus Marine and Environment
Monitoring Service (CMEMS)", no?