DEP: flagging the SHA module for removal

[bsipocz]

I run into failures in #2906 coming from the SHA module, so this deprecation cannot be postponed any longer.

The Spitzer datasets should be accessible via the more standard IRSA VO tools, the one missing step (besides actually removing the module) is to write more documentation with Spitzer examples (#2834)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f63cd84) 67.30% compared to head (0363bf4) 67.08%.
Report is 9 commits behind head on main.

❗ Current head 0363bf4 differs from pull request most recent head ab4c4d3. Consider uploading reports for the commit ab4c4d3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2924      +/-   ##
==========================================
- Coverage   67.30%   67.08%   -0.23%     
==========================================
  Files         235      235              
  Lines       18135    18135              
==========================================
- Hits        12206    12166      -40     
- Misses       5929     5969      +40     

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