enhance: [Cherry-pick] Save collection targets by batches (#31616) #31655
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Cherry-pick from master
pr: #31616
See also #28491 #31240
When colleciton number is large, querycoord saves collection target one by one, which is slow and may block querycoord exits.
In local run, 500 collections scenario may lead to about 40 seconds saving collection targets.
This PR changes the
SaveCollectionTarget
interface into batch one and organizes the collection in 16 per bundle batches to accelerate this procedure.