track_local: Add write_rtp_with_attributes

[haaspors]

This makes it easier to inject Attributes to the interceptor chain just using TrackLocalStaticRTP

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 60.62%. Comparing base (8d95518) to head (2945295).

Files with missing lines	Patch %	Lines
...tc/src/track/track_local/track_local_static_rtp.rs	73.33%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #612   +/-   ##
=======================================
  Coverage   60.62%   60.62%           
=======================================
  Files         471      471           
  Lines       48237    48249   +12     
  Branches    12535    12550   +15     
=======================================
+ Hits        29242    29250    +8     
+ Misses       9671     9669    -2     
- Partials     9324     9330    +6     

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