Added DialAssociation and ListenAssociation

[backkem]

These are helpers to easily run SCTP over UDP. Example adapted. I added the Association postfix to keep space for a potential Dial/Listen implementation that directly gives you a Stream.

Relates to #74

TODO:

• [x] Tag pion/udp after landing CI
• [ ] Change to SCTP over IP instead of over UDP.
• [ ] Proper shutdown for the listener.

[codecov[bot]]

Codecov Report

Merging #126 into master will decrease coverage by 2.39%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   78.62%   76.22%   -2.40%     
==========================================
  Files          43       45       +2     
  Lines        2779     2869      +90     
==========================================
+ Hits         2185     2187       +2     
- Misses        459      548      +89     
+ Partials      135      134       -1     

Flag	Coverage Δ
#go	76.22% <0.00%> (-2.40%)	:arrow_down:
#wasm	67.82% <0.00%> (-3.57%)	:arrow_down:

Impacted Files	Coverage Δ
association.go	82.11% <0.00%> (-0.27%)	:arrow_down:
chunk_payload_data.go	69.69% <ø> (ø)
dialer.go	0.00% <0.00%> (ø)
listener.go	0.00% <0.00%> (ø)
stream.go	86.28% <0.00%> (-5.23%)	:arrow_down:

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[backkem]

Playing around with adding Dial and Listen. However, it's not directly clear how to handle the streamIdentifier and defaultPayloadType. We could:

• Add them to the method signature or config.
• Somehow encode them into the address urls.
• Pick a default and only offer that when using these high-level methods. However, it's not clear what defaultPayloadType to pick. Suggestions welcome. I may go with the 3rd option for now and just hardcode PayloadTypeWebRTCDCEP.