Remove stats dropped from the specification

[fippo]

Removes stats dropped by
w3c/webrtc-stats#622
that were not populated by pion either:

Type	Removed
inbound-rtp	sliCount, packetsRepaired, burstPacketsLost,
	burstPacketsDiscarded, burstLossCount,
	burstDiscardCount, burstLossRate,
	burstDiscardRate, gapLossRate,
	gapDiscardRate, averageRtcpInterval,
	packetsFailedDecryption, packetsDuplicated
outbound-rtp	sliCount, packetsDiscardedOnSend,
	fecPacketsSent, bytesDiscardedOnSend,
	averageRtcpInterval
remote-inbound-rtp	sliCount, packetsRepaired, burstPacketsLost,
	burstPacketsDiscarded, burstLossCount,
	burstDiscardCount, burstLossRate,
	burstDiscardRate, gapLossRate,
	gapDiscardRate
remote-outbound-rtp	sliCount, packetsDiscardedOnSend,
	fecPacketsSent, bytesDiscardedOnSend
codec	codecType
csrc	the whole type

(2017->2022, we are getting closer)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.40%. Comparing base (019bb23) to head (7edbba6).
⚠️ Report is 6 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3602      +/-   ##
==========================================
- Coverage   90.44%   90.40%   -0.04%     
==========================================
  Files          81       81              
  Lines        9221     9193      -28     
==========================================
- Hits         8340     8311      -29     
- Misses        881      882       +1     

Flag	Coverage Δ
go	90.40% <ø> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[JoTurk]

@kcaffrey you made this PR recently to fix the SLI parser pion/rtcp#222 do you use SLIs? I think if yes, we shouldn't remove the stats, even if removed by w3c and libwebrtc

[fippo]

how is sliceLoss filled? I've never seen it useful for the way webrtc does video encoding

[kcaffrey]

No, I don’t use SLIs. I was making some other edits to rtcp when I saw that bug and decided to fix it in its own PR (with the spirit of leaving things better than I found it).