[MSE] add more source buffer logging

[MSE] add more source buffer logging
https://bugs.webkit.org/show_bug.cgi?id=193995
<rdar://problem/47650399>

Reviewed by Jon Lee.

No new tests, no functional change.

* platform/graphics/avfoundation/objc/SourceBufferPrivateAVFObjC.mm:
(WebCore::SourceBufferPrivateAVFObjC::resetParserState):
(WebCore::SourceBufferPrivateAVFObjC::setReadyState):
(WebCore::SourceBufferPrivateAVFObjC::trackDidChangeEnabled):
(WebCore::SourceBufferPrivateAVFObjC::enqueueSample):
(WebCore::SourceBufferPrivateAVFObjC::willSeek):
(WebCore::SourceBufferPrivateAVFObjC::setDecompressionSession):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@240701 268f45cc-cd09-0410-ab3c-d52691b4dbfc