Implement GetIndexStatistics interface

[wayblink]

related: #22888

proto: https://github.com/milvus-io/milvus-proto/pull/131

[mergify[bot]]

@wayblink Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)

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[codecov[bot]]

Codecov Report

Merging #23603 (a8bae61) into master (6b29a99) will increase coverage by 0.03%. The diff coverage is 80.25%.

@@            Coverage Diff             @@
##           master   #23603      +/-   ##
==========================================
+ Coverage   82.04%   82.07%   +0.03%     
==========================================
  Files         742      742              
  Lines       96920    97142     +222     
==========================================
+ Hits        79518    79731     +213     
- Misses      14441    14451      +10     
+ Partials     2961     2960       -1     

Impacted Files	Coverage Δ
internal/proxy/task_index.go	71.96% <62.33%> (-1.62%)	:arrow_down:
internal/distributed/datacoord/client/client.go	74.40% <70.00%> (+0.61%)	:arrow_up:
internal/proxy/impl.go	81.17% <81.94%> (-0.02%)	:arrow_down:
internal/datacoord/index_service.go	94.96% <98.57%> (+0.64%)	:arrow_up:
internal/distributed/datacoord/service.go	92.23% <100.00%> (+0.07%)	:arrow_up:
internal/util/mock/grpc_datacoord_client.go	91.01% <100.00%> (+0.20%)	:arrow_up:

... and 8 files with indirect coverage changes

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[soothing-rain]

/lgtm

[soothing-rain]

/lgtm

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[wayblink]

rerun ut

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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