Rename eccode to ec

[nagutm]

This pull request addresses the following issue: #1404

The following changes are implemented:

• Rename eccode prefix to ec
• preferred_prefix is set to EC
• Maintain eccode as a synonym
• Update any instances of provides: eccode to provides: ec

A few additional files that referenced eccode are updated to reflect this change as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.80%. Comparing base (8950e70) to head (6bd4d1e).
Report is 309 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1413      +/-   ##
==========================================
+ Coverage   42.51%   46.80%   +4.29%     
==========================================
  Files         117      118       +1     
  Lines        8327     8332       +5     
  Branches     1963     1354     -609     
==========================================
+ Hits         3540     3900     +360     
+ Misses       4582     4239     -343     
+ Partials      205      193      -12     

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[bgyori]

Looks great, thanks!

[bgyori]

Oh actually, just noticed one more small thing, we might want to update this sentence:

bioregistry/docs/CONTRIBUTING.md

Line 73 in 7fae7ba

Identifiers.org's `ec-code` was renamed to `eccode` while maintaining `ec-code`