[cdc-connector][mysql]Mysql add numRecordsOutBySnapshot and numRecordsOutByIncremental metrics

[ChengJie1053]

numRecordsOutBySnapshot metrics collects snapshot statistics

numRecordsOutByIncremental metrics collects incremental statistics

numRecordsOutByIncremental has three metrics, respectively is numRecordsOutByIncrementalInsert, numRecordsOutByIncrementalUpdate, numRecordsOutByIncrementalDelete

2024.7.12 change metrics name，change numRecordsOutByIncrementalInsert to numRecordsOutByDataChangeEventInsert

[yuxiqian]

Seems we can't come up with a "best" metric design for everyone: Some may want a task-level unified record counter, while some may want fine-grained counters for each table. Or one may want to disable it entirely to avoid any extra cost.

I wonder if we should add an option to control metric behavior? cc @ruanhang1993

[SML0127]

@ChengJie1053 cc. @yuxiqian Is thera any changes or progress? If not, I want to create new PR with my suggestion at next week. (I need this feature.)

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