Generalize SsrcCache codec-specific packet rewriting code.

[JonathanLennox]

No description provided.

[codecov]

Codecov Report

Merging #2027 (508a5a0) into master (1da507f) will increase coverage by 0.20%.
The diff coverage is 8.69%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2027      +/-   ##
============================================
+ Coverage     42.50%   42.70%   +0.20%     
- Complexity     1676     1679       +3     
============================================
  Files           326      326              
  Lines         17014    17034      +20     
  Branches       2246     2250       +4     
============================================
+ Hits           7232     7275      +43     
+ Misses         9077     9046      -31     
- Partials        705      713       +8     

Impacted Files	Coverage Δ
...src/main/kotlin/org/jitsi/videobridge/SsrcCache.kt	42.50% <8.69%> (-5.23%)	⬇️

... and 5 files with indirect coverage changes

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