Refactor CDC layer

[sandynz]

Related to #22500

Reduce CDC code layer, make it similar as migration etc.

Purpose: 1) Cleaner code, 2) Prepare for unified code refactoring.

Changes proposed in this pull request:

• Add unified PipelineSink and impl: PipelineDataSourceSink and PipelineSocketSink
• Add CDCImporter, CDCAckId; Remove SocketSinkImporter, SocketSinkImporterCreator, CDCAckHolder, CDCDataRecordUtils, DataRecordComparatorGenerator; Refactor PipelineChannel, PipelineSink and impls;
• Add SingleChannelConsumerImporter for common usage
• Add inventory and incremental task for CDC; Refactor CDCJobPreparer, CDCJob, CDCTasksRunner

Part of general structure and process:

• Use 1 job item of ejob, and sharding items are simulated by CDCJob, since task progress is binded in PipelineJobItemContext.
• 1 importer will consume several dumpers for inventory and incremental tasks.
• Incremental tasks will start after all inventory tasks are completed.

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[sandynz]

TODO: Improve XA support in next PR