feat: Add auto-discovery from popular services

[janw]

Fixes #175

[codecov]

Codecov Report

Attention: Patch coverage is 93.67816% with 11 lines in your changes missing coverage. Please review.

Project coverage is 92.57%. Comparing base (7fe8f14) to head (eca75e9).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
podcast_archiver/utils/__init__.py	28.57%	5 Missing ⚠️
podcast_archiver/processor.py	80.00%	1 Missing and 1 partial ⚠️
podcast_archiver/urls/base.py	92.30%	0 Missing and 2 partials ⚠️
podcast_archiver/models/feed.py	95.45%	0 Missing and 1 partial ⚠️
podcast_archiver/urls/prefixed.py	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
+ Coverage   91.91%   92.57%   +0.65%     
==========================================
  Files          22       29       +7     
  Lines        1150     1306     +156     
  Branches      106      129      +23     
==========================================
+ Hits         1057     1209     +152     
- Misses         67       68       +1     
- Partials       26       29       +3     

Files with missing lines	Coverage Δ
podcast_archiver/console.py	100.00% <ø> (ø)
podcast_archiver/constants.py	100.00% <100.00%> (ø)
podcast_archiver/exceptions.py	100.00% <100.00%> (ø)
podcast_archiver/urls/__init__.py	100.00% <100.00%> (ø)
podcast_archiver/urls/base64.py	100.00% <100.00%> (ø)
podcast_archiver/urls/fireside.py	100.00% <100.00%> (ø)
podcast_archiver/urls/soundcloud.py	100.00% <100.00%> (ø)
podcast_archiver/urls/via_apple.py	100.00% <100.00%> (ø)
podcast_archiver/models/feed.py	93.16% <95.45%> (+3.53%)	⬆️
podcast_archiver/urls/prefixed.py	91.66% <91.66%> (ø)
... and 3 more

... and 2 files with indirect coverage changes

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