Add new APIs to enable simulcast probes without dropping packets

[cptpcrd]

Description

Part of pion/webrtc#2777

Reference issue

N/A

[codecov]

Codecov Report

❌ Patch coverage is 35.89744% with 25 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v2@f598d3b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
stream_srtp.go	0.00%	23 Missing and 1 partial ⚠️
session_srtp.go	90.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (35.89%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@          Coverage Diff          @@
##             v2     #276   +/-   ##
=====================================
  Coverage      ?   76.82%           
=====================================
  Files         ?       17           
  Lines         ?     1001           
  Branches      ?        0           
=====================================
  Hits          ?      769           
  Misses        ?      139           
  Partials      ?       93           

Flag	Coverage Δ
go	76.82% <35.89%> (?)
wasm	76.32% <35.89%> (?)

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