Add datachannel whip whep example

[ValorZard]

Description

Add datachannel whip whep example
(probably going to add two examples, one js based and one detached pure golang example)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.68%. Comparing base (3e2a804) to head (dae2163).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3115      +/-   ##
==========================================
- Coverage   78.72%   78.68%   -0.05%     
==========================================
  Files          91       91              
  Lines       11401    11401              
==========================================
- Hits         8976     8971       -5     
- Misses       1937     1940       +3     
- Partials      488      490       +2     

Flag	Coverage Δ
go	80.57% <ø> (-0.05%)	⬇️
wasm	63.84% <ø> (ø)

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[ValorZard]

I give permission to any maintainers to make commits for me btw