Support discouraged but allowed "$id" values

[handrews]

Fixes #69: Non-normalized URIs and (prior to draft-next) URis with empty fragments are allowed. The official test suite does not pick up these issues, so additional tests have been included.

[codecov-commenter]

Codecov Report

Patch coverage: 85.18% and project coverage change: -0.01 ⚠️

Comparison is base (599be33) 92.49% compared to head (e4e8d7d) 92.49%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   92.49%   92.49%   -0.01%     
==========================================
  Files          21       22       +1     
  Lines        1999     2024      +25     
  Branches      424      428       +4     
==========================================
+ Hits         1849     1872      +23     
- Misses         96       98       +2     
  Partials       54       54              

Impacted Files	Coverage Δ
jschon/vocabulary/future.py	76.47% <76.47%> (ø)
jschon/catalog/_next.py	100.00% <100.00%> (ø)
jschon/jsonschema.py	90.90% <100.00%> (+0.24%)	⬆️
jschon/vocabulary/core.py	84.29% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[handrews]

OK I think I got everything, but of course let me know if I missed something.

[handrews]

The coverage failure is mostly due to the draft-next tests not being run now that the draft-next version is separate. If they were (see PRs #97 and #98), the patch coverage for the new class would be the same as for the old one.

[marksparkza]

Thanks, just a couple of things: a change log entry seems to have snuck into 0.10.0, and just a reminder to double quote the strings in JSONSchema._bootstrap

[handrews]

Thanks, just a couple of things: a change log entry seems to have snuck into 0.10.0
I could have sworn I fixed that! 🤦

and just a reminder to double quote the strings in JSONSchema._bootstrap
I had completely missed that comment the first time around, thanks for the explanation. I'll try to remember that - I default to single quotes as a hangover from Perl where single quotes turn off string interpolation for better performance.

That should be everything now.