add ice trickle support

[ValorZard]

Description

Second half of pion/webrtc#2898. See pion/webrtc#3097 for more details

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 65.68%. Comparing base (c395deb) to head (5d30179).

Files with missing lines	Patch %	Lines
jsep.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   65.84%   65.68%   -0.16%     
==========================================
  Files          12       12              
  Lines        1660     1664       +4     
==========================================
  Hits         1093     1093              
- Misses        467      471       +4     
  Partials      100      100              

Flag	Coverage Δ
go	65.68% <0.00%> (-0.16%)	⬇️
wasm	65.50% <0.00%> (-0.34%)	⬇️

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[ValorZard]

Actually I just realized that this is probably all the changes needed here I think, since the rest has to be done in the webrtc repo

[JoeTurki]

Yeah there is no extra logic to handle at the receiver, Can you reword your commit message? Error: Capitalize the subject line

Thank you :)

[JoeTurki]

Thanks

[JoeTurki]

@ValorZard Thank you so much, will you be able to squash your commits into a single commit and fix the commit messages, I can do it myself if no :)

Also check your email I invited you to the org so you're able to make branches, and run the CI directly :)

[JoeTurki]

I was not able to push to your fork (permission denied) to fixup the commit, but i pushed your commit fb5eb14 congrats on your first commit :)