change the way for logging integration

[serjshevchenko]

Fix problem related to Note "Note that this only takes effect for loggers created after the integration."
Face with such issue when was trying to integrate opencensus-logging into uvicorn+FastAPI.
uvicorn starts application in new thread/process and creates uvicorn logger object in new thread/process before opencensus-logging-integration execution.
TraceLogger just overrides makeRecord, logging.setLogRecordFactory is a better approach because it has not drawback with time of logger object initialization.

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[serjshevchenko]

@googlebot I signed it!

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We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[serjshevchenko]

@googlebot I fixed it.

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We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[serjshevchenko]

because of wrong email address in first commit msg, I could not pass cla/google check.
Closing this PR and opening new one (same code changes) #1084.