refactor: stabilise wire logging

[Nytelife26]

Relevant issues

Resolves #1427.

Brief

Implement stable infallible JSON logging for Proselint.

Changes

• Move OutputFormat to proselint.log
• Use correct output streams for log levels
• Move LintResult to proselint.tools
• Introduce infallible JSON logging
• Use span and pos in CheckResult and LintResult

Credits

@jclicodes for greatly helping with authoring and refining the wire specification.

[codecov]

Codecov Report

❌ Patch coverage is 65.06849% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.12%. Comparing base (e12a943) to head (8af2cc9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
proselint/log.py	59.55%	36 Missing ⚠️
proselint/command_line.py	55.00%	9 Missing ⚠️
proselint/tools.py	82.85%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1444      +/-   ##
==========================================
- Coverage   94.19%   91.12%   -3.08%     
==========================================
  Files         100      100              
  Lines         948     1037      +89     
==========================================
+ Hits          893      945      +52     
- Misses         55       92      +37     

Flag	Coverage Δ
macos-latest	90.54% <65.06%> (-3.02%)	⬇️
py3.10	91.12% <65.06%> (-3.08%)	⬇️
py3.11	91.12% <65.06%> (-3.08%)	⬇️
py3.12	91.12% <65.06%> (-3.08%)	⬇️
py3.13	90.54% <65.06%> (-3.02%)	⬇️
py3.14	90.54% <65.06%> (-3.02%)	⬇️
ubuntu-latest	90.54% <65.06%> (-3.02%)	⬇️
windows-latest	91.12% <65.06%> (-3.08%)	⬇️

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