Parse Candidate Extensions (RFC5245)

[joeturki]

Description

• Rewrote UnmarshalCandidate to better align with RFC5245.
• Added new methods for extracting candidate extensions.
• Updated Equal and Marshal to accommodate these changes.
• Added tests for everything.
• Fixed a "bug" where tcptype would appear before raddr .
• Made a minor change to gather.go; because we can't use the config struct as a map key anymore.
• Added CandidateExtension.

I'm aware this is a breaking change but this change is required for many issues like pion/webrtc#2993

Edit: I'll make it non breaking change tomorrow.

Reference issue

#753

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.98%. Comparing base (abdc0ca) to head (dddadd5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   78.63%   79.98%   +1.35%     
==========================================
  Files          41       41              
  Lines        4769     5017     +248     
==========================================
+ Hits         3750     4013     +263     
+ Misses        785      775      -10     
+ Partials      234      229       -5     

Flag	Coverage Δ
go	79.98% <100.00%> (+1.35%)	⬆️
wasm	27.78% <100.00%> (+4.68%)	⬆️

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[nils-ohlmeier]

Just a few minor suggestions. But looks good otherwise.

[Sean-Der]

Nice, love these improvements :)

Glad we can do this without API break. It means people don’t update and new versions don’t get improved :(

[joeturki]

I added CandidateExtensions and CandidateExtension, And fixed all the other issues.

@Sean-Der @nils-ohlmeier let me know if there are other problems :)

Thanks.

[nils-ohlmeier]

Looks good to me.

[Sean-Der]

Fantastic! This is great.

Sorry about the stress of APIs. It’s just so hard to fix them. We can always fix/improve code though.

Its nice to expose as little as possible until someone requests it :)

[joeturki]

@Sean-Der When you have a time can you take a look.

Sorry about the stress of APIs. It’s just so hard to fix them. We can always fix/improve code though.

It's not stressing at all for me :)

Its nice to expose as little as possible until someone requests it :)

This makes sense, Noted :)