tone down debugs from codec modules

[lthiery]

Some logging frameworks don't really tolerate module level configurations well. I have quite a broad project but h2 seems to be the only dependency that has such chatty debug settings.

Would you be open-minded to removing all debug! in favor of trace!?

[seanmonstar]

This library already has a lot of noise at the trace level, the things at debug level are indeed helpful for many people to debug without needing the full firehose.

I don't think the solution is to reduce the helpfulness of the logs for those people, but to use a logger that allows you to adjust specific libraries if you don't want their logs.

[lthiery]

I'm still trying to fix that but this is also the only crate that's causing so much chattiness. Perhaps if just the "send" in frame_write and "read" in frame_read could be downgraded?

[lthiery]

@seanmonstar checking in to see if this level of change would acceptable? the scope has been narrowed to only the messages that I believe are very chatty. I do agree that a logging system should be capable of tuning logs per module, but I also believe that debug logging should be a little less active than h2 is with these two instances.

Of course, up to you and will close and move on if you're not into it. Thanks for your work!