Make Bytes/Messages Sent/Received public on data channels

[danjenkins]

Description

BytesReceived, BytesSent, MessagesReceived and MessagesSent are all used to create stats but sometimes you don't want to go through all the stats...

This makes those methods available directly on a data channel

I'm not sure we need to add any tests... they're already tested in datachannel module

[danjenkins]

Actually, I don't think this is necessary, I've just got this info via GetStats() and it worked well. Let me know what you think

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.41%. Comparing base (aa9c623) to head (ae18317).

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2766       +/-   ##
===========================================
- Coverage   78.91%   64.41%   -14.50%     
===========================================
  Files          87       65       -22     
  Lines        8208     3164     -5044     
===========================================
- Hits         6477     2038     -4439     
+ Misses       1263      997      -266     
+ Partials      468      129      -339     

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[Sean-Der]

Thanks for the PR @danjenkins!

I don't see these in the W3C docs, so my gut says we probably should not do it. I am afraid if we have inconsistent APIs between implementations that it will frustrate users :(

If the GetStats API doesn't have something you need tell me and I would love to implement it!

https://www.w3.org/TR/webrtc/#webidl-1143016005

[danjenkins]

Thanks for the PR @danjenkins!

I don't see these in the W3C docs, so my gut says we probably should not do it. I am afraid if we have inconsistent APIs between implementations that it will frustrate users :(

If the GetStats API doesn't have something you need tell me and I would love to implement it!

https://www.w3.org/TR/webrtc/#webidl-1143016005

Completely agree. Once I'd realised how to go grab these stats then things fell into place