HDR Dynamic Metadata Splitting

[superyu1337]

Add HDR Dynamic Metadata splitting for both Dolby Vision RPUs and HDR10+ JSONs.

Related issue: #1005

Implementation

Adds two new parameters:

• --dolby-vision-rpu <path>
• --hdr10plus-json <path>

After running scene detection we load the RPU/JSON and split it.
This runs when creating the list Scenes whether that is by running scene detection or parsing an exisiting scenes.json.
It does not introduce changes to scenes.json, but adds a new field in the internally used Scene struct.

Todo

• Sanity check on various inputs
• Check if deserialization of scenes.json is broken
  • It could be that the deserialization is now incompatible with scenes.json files that don't include the new field.
  • No changes to scenes.json are made after 7d40165
• Support more encoders?
  • I'm not sure about the current support for either features on the Av1an supported encoder list.
• Make it safer
  • At the moment the the argument for the encoder just gets appended to the user provided argument list. It would be safer to replace it if it exists already.

Possible Todos

• Implement automatic RPU conversion to Profile 8/10
• Implement automatic extraction of dynamic metadata

[codecov]

Codecov Report

❌ Patch coverage is 31.87500% with 109 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.20%. Comparing base (94ea800) to head (7d40165).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
av1an-core/src/scenes/mod.rs	13.72%	88 Missing ⚠️
av1an-core/src/context.rs	61.11%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1151      +/-   ##
==========================================
- Coverage   62.00%   61.20%   -0.80%     
==========================================
  Files          23       23              
  Lines        6416     6553     +137     
==========================================
+ Hits         3978     4011      +33     
- Misses       2438     2542     +104     

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