EUCLID: new method get_sia to access the Simple Image Access Protocol (SIAP) v2.0

[cosmoJFH]

Dear astroquery team,

we would like to implement a new method for the Simple Image Access Protocol (SIAP) v2.0 exposed by the Euclid project.

The Euclid Archive applies the following IVOA standard to serve:

1. Tables (catalogues), via the IVOA Table Access Protocol TAP
2. Spectra, via the IVOA DataLink prococol.
3. Images (and cutouts), via the Simple Image Access (SIA)

The new get_sia method will allow users to obtain the “file_name” and “file_path” of the FITS files that contain the observations of the input coordinates.

cc @esdc-esac-esa-int
jira: EUCLIDSWRQ-250

Note that this PR clones #3506, that was closed due to an error when updating the remote branch.

[codecov]

Codecov Report

❌ Patch coverage is 87.30159% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.13%. Comparing base (6a3c231) to head (5a6fea2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
astroquery/esa/euclid/core.py	88.13%	7 Missing ⚠️
astroquery/utils/tap/core.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3569      +/-   ##
==========================================
+ Coverage   73.09%   73.13%   +0.04%     
==========================================
  Files         219      219              
  Lines       20592    20653      +61     
==========================================
+ Hits        15052    15105      +53     
- Misses       5540     5548       +8     

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