Transceivers state change from inactive to active

[zjzhang-cn]

Description

Reuse transceivers in remote peer。

In the existing RTC Transceivers, when the state of the remote transceiver changes from inactive to active, the state of the pion also needs to change from inactive to active。

Reference issue

Fixes #...

[codecov]

Codecov Report

Attention: Patch coverage is 34.21053% with 25 lines in your changes missing coverage. Please review.

Project coverage is 77.45%. Comparing base (61f69be) to head (cc4f788).
Report is 321 commits behind head on master.

Files with missing lines	Patch %	Lines
peerconnection.go	34.21%	22 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2426      +/-   ##
==========================================
- Coverage   77.52%   77.45%   -0.08%     
==========================================
  Files          87       87              
  Lines        9294     9358      +64     
==========================================
+ Hits         7205     7248      +43     
- Misses       1654     1680      +26     
+ Partials      435      430       -5     

Flag	Coverage Δ
go	79.19% <34.21%> (-0.10%)	⬇️
wasm	70.15% <ø> (ø)

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[cnderrauber]

Thank you for refining this, can you add a test case for this?

[zjzhang-cn]

Client peer cooperation is required.

[Sean-Der]

Hey @zjzhang-cn thank you so much for the contribution!

Since this isn't a webrtc-pc API I don't believe merging it is the right thing to do. If a user wants to re-use a Transceiver they should find an inactive Transceiver and call ReplaceTrack I believe?

If I am wrong please re-open! I would love to see Pion be as good as possible.

thank you