Implement GetIndexStatistics interface

[wayblink]

#22888

[mergify[bot]]

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@wayblink ut workflow job failed, comment rerun ut can trigger the job again.

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[codecov[bot]]

Codecov Report

Merging #24589 (5593fdb) into 2.2.0 (5d297ae) will increase coverage by 0.04%. The diff coverage is 82.53%.

@@            Coverage Diff             @@
##            2.2.0   #24589      +/-   ##
==========================================
+ Coverage   80.84%   80.88%   +0.04%     
==========================================
  Files         759      759              
  Lines      106566   106864     +298     
==========================================
+ Hits        86152    86440     +288     
- Misses      17103    17112       +9     
- Partials     3311     3312       +1     

Impacted Files	Coverage Δ
internal/distributed/indexcoord/client/client.go	52.60% <40.00%> (-0.70%)	:arrow_down:
internal/proxy/task_index.go	78.68% <75.64%> (-0.47%)	:arrow_down:
internal/proxy/impl.go	81.00% <82.43%> (-0.01%)	:arrow_down:
internal/indexcoord/index_coord.go	81.66% <91.30%> (+0.69%)	:arrow_up:
internal/distributed/indexcoord/service.go	67.14% <100.00%> (+0.32%)	:arrow_up:
internal/indexcoord/index_coord_mock.go	92.82% <100.00%> (+0.31%)	:arrow_up:

... and 24 files with indirect coverage changes

[wayblink]

rerun ut

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[xiaocai2333]

/lgtm

[mergify[bot]]

@wayblink E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[wayblink]

/run-cpu-e2e

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@wayblink E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[wayblink]

/run-cpu-e2e

[xiaofan-luan]

Let's put it into 2.2.10

[czs007]

/approve /lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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