fix(compactor): collect metrics for fast compact runer

[Little-Wallace]

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What's changed and what's your intention?

In passed implementation, we do not record drop key size for fast compaction algorithm, it will cause the table size calculated by meta-node less than sum of uncompressed size of all files.

close #12926

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[zwang28]

LGTM.

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[Little-Wallace]

same with #13064