Introduce Snapshot about yorkie HOT 4 CLOSED

The response size of the attach API with 3972 changes is about 1.3 Mb in CodeMirror example.

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without snapshot

The response size of the attach API with 4343 changes without a snapshot is about 2.5 Mb in Drawing example.

with snapshot

The response size of the attach API with 4250 changes with a snapshot is about 0.789 Mb in Drawing example.

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I think that the payload will be reduced if we replace the size of actorID or perform garbage collection as follow-up work.

#3
#36

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with snapshot + replace actor_id(24 bytes string -> 12 bytes array)

The response size of the attach API with 4296 changes with a snapshot is about 0.636 MB in Drawing example.

#36

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