[Enhancement]: TargetOberserver support global checker to avoid frequent check on all the collections

[xiaofan-luan]

Is there an existing issue for this?

• I have searched the existing issues

What would you like to be added?

1. Figure out a hash finger print that could calculate the state of collection target, and able to compare diff.
2. before we do PullNextTargetV2 on each collection, check the global fingerprint difference on each collection, this could avoid unnecessary target pulling if the collection target doesn't have any change.

With this improvement, I believe this will save great effort on pulling target when there are many collections(More than 10k) in one collection

Why is this needed?

No response

Anything else?

No response

[xiaofan-luan]

/assign @weiliu1031

[stale]

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