client: support extracting absolute timestamp of incoming data

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (9eb4ef3) 71.50% compared to head (d74a3bd) 71.79%.

Files	Patch %	Lines
client_stream_processor_mpegts.go	68.05%	17 Missing and 6 partials ⚠️
client_stream_processor_fmp4.go	68.29%	9 Missing and 4 partials ⚠️
client.go	60.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   71.50%   71.79%   +0.29%     
==========================================
  Files          43       43              
  Lines        3636     3702      +66     
==========================================
+ Hits         2600     2658      +58     
- Misses        833      835       +2     
- Partials      203      209       +6     

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