Implement content negotiation for resources, registries, and collections

[cthoyt]

This PR adds content negotiation to the UI pages for resources (e.g., GO), registries (e.g., BARTOC), and collections. It's enable to serve JSON and YAML direct dumps of the internal Pydantic models OR the RDF flavor. I'm guessing I will find that the FAIR Evaluator expects some more specific things from the RDF, which we can update next.

CC @micheldumontier @vemonet

[codecov-commenter]

Codecov Report

Base: 39.28% // Head: 39.40% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (fa959d5) compared to base (e92228c).
Patch coverage: 81.13% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #682      +/-   ##
==========================================
+ Coverage   39.28%   39.40%   +0.12%     
==========================================
  Files         129      129              
  Lines        7265     7298      +33     
  Branches     1654     1663       +9     
==========================================
+ Hits         2854     2876      +22     
- Misses       4240     4249       +9     
- Partials      171      173       +2     

Impacted Files	Coverage Δ
src/bioregistry/app/utils.py	77.22% <73.07%> (-3.73%)	⬇️
src/bioregistry/app/api.py	55.94% <80.00%> (+0.46%)	⬆️
src/bioregistry/app/ui.py	82.29% <100.00%> (+0.97%)	⬆️
src/bioregistry/version.py	68.42% <100.00%> (ø)
src/bioregistry/utils.py	62.04% <0.00%> (-0.73%)	⬇️
src/bioregistry/schema/struct.py	87.24% <0.00%> (-0.12%)	⬇️

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