Add field for annotating unresolvable ontologies, update OLS processing, and better annotate HPATH

[cthoyt]

Closes #927

This PR does the following:

• Adds a new boolean field uri_format_resolvable so we can explicitly annotate when URI format strings are known to not be resolvable
• Adds a note on to the page for a resource when this flag is set to true
• Updates OLS download processing to more carefully annotate if the download is OWL, OBO, RDF, or other

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (d0292d2) 40.93% compared to head (3861523) 40.89%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
src/bioregistry/external/ols.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #993      +/-   ##
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- Coverage   40.93%   40.89%   -0.05%     
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  Files         138      138              
  Lines        7905     7916      +11     
  Branches     1841     1845       +4     
==========================================
+ Hits         3236     3237       +1     
- Misses       4467     4477      +10     
  Partials      202      202              

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