[FEATURE] inspect subcommand

[jmbannon]

Subscription file syntax is designed to minimize boiler-plate when authoring new subscriptions.
You can now unpack any subscription using the inspect sub-command to see its boiler-plate preset format.

ytdl-sub inspect --config /path/to/config.yaml --match "BBC News" /path/to/subscriptions.yaml

This can be utilized for numerous purposes including:

• Ensuring your custom preset is getting applied correctly.
• Figuring out which variables set things like file names, metadata, etc.
• Understanding how subscription syntax translates to preset representation.

The default --level of inspect will fill in defined variables. Using --level original will present the subscription's raw layout with no fill.

[codecov]

Codecov Report

❌ Patch coverage is 84.28571% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.35%. Comparing base (e34b9b6) to head (3ef0c9d).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ytdl_sub/cli/entrypoint.py	69.56%	7 Missing ⚠️
.../ytdl_sub/config/validators/variable_validation.py	90.00%	3 Missing ⚠️
src/ytdl_sub/main.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1407      +/-   ##
==========================================
- Coverage   92.44%   92.35%   -0.10%     
==========================================
  Files         117      117              
  Lines        7681     7734      +53     
==========================================
+ Hits         7101     7143      +42     
- Misses        580      591      +11     

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