buffer: Avoid calling dump_unique_id_hex if log level is not trace

[Garfield96]

Which issue(s) this PR fixes:
N/A

What this PR does / why we need it:
This PR adapts the logging for buffers to avoid calls of dump_unique_id_hex if the current log level is not trace. During high-load situations with a small chunk size, this makes a noticeable difference.

Docs Changes:

Release Note:
buffer: Avoid unnecessary log processing. It will improve performance.

[github-actions]

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[daipom]

Thanks! LGTM.
Sorry for the late response.

[daipom]

This fix is not a bug fix, but a performance improvement.
So, I'm wondering if I should put this in v1.16.4 or v1.17.0.

For now, I'm thinking that we can put this in v1.16.4 because this changes codes for logging only.
If anyone has an opinion, please tell me. If not, I will merge this to the v1.16 branch.

[ashie]

All fixes should be merged into master at first, then consider whether or not back port it to v1.16 branch.
I agree backporting it to v1.16.

[daipom]

Thanks! Sorry for the confusion. Yes. All fixes should be merged to the master branch first.

I wanted to say that if I merged this, I would forget that I was wondering whether to backport this or not, so I wanted to merge this after deciding it.

I'll wait a few days and backport this if there is no other opinion.