Use 64 bit candidate pair packet counters

[fippo]

packetsSent and packetsReceived are unsigned long long in the specification since w3c/webrtc-stats#494

[fippo]

api check is ok since we can do this in the major RC?

Removes a widening conversion from pion/webrtc#3612

[JoTurk]

@fippo yeah it's fine

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.77%. Comparing base (85c387f) to head (5886b3c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1031      +/-   ##
==========================================
- Coverage   91.88%   91.77%   -0.12%     
==========================================
  Files          45       45              
  Lines        5447     5447              
==========================================
- Hits         5005     4999       -6     
- Misses        442      448       +6     

Flag	Coverage Δ
go	91.77% <100.00%> (-0.12%)	⬇️

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