Implement ReportImport related logic.

[soothing-rain]

Upon receiving ReportImport request, rootcoord will do the following:

1. Update the import task status in Etcd.
2. Start watch indexing building status of the segments created by this task. When all indices are built for these segments, rootcoord will mark these segments "ready to go online".

/kind feature

issue: #15604

Signed-off-by: Yuchen Gao yuchen.gao@zilliz.com

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[codecov]

Codecov Report

Merging #16225 (a62d3ba) into master (40c703d) will decrease coverage by 0.14%.
The diff coverage is 59.12%.

❗ Current head a62d3ba differs from pull request most recent head efb35fe. Consider uploading reports for the commit efb35fe to get more accurate results

@@            Coverage Diff             @@
##           master   #16225      +/-   ##
==========================================
- Coverage   81.03%   80.89%   -0.15%     
==========================================
  Files         411      413       +2     
  Lines       61940    62384     +444     
==========================================
+ Hits        50196    50463     +267     
- Misses       9366     9517     +151     
- Partials     2378     2404      +26     

Impacted Files	Coverage Δ
internal/querycoord/cluster.go	79.04% <0.00%> (-0.69%)	⬇️
internal/rootcoord/timeticksync.go	90.25% <ø> (ø)
internal/querycoord/meta.go	76.31% <3.77%> (-1.30%)	⬇️
internal/querycoord/replica.go	13.95% <13.95%> (ø)
internal/rootcoord/import_manager.go	85.17% <88.99%> (+0.92%)	⬆️
internal/rootcoord/root_coord.go	80.43% <95.00%> (+0.80%)	⬆️
...nternal/querynode/flow_graph_filter_delete_node.go	82.89% <0.00%> (-5.27%)	⬇️
internal/kv/mem/mem_kv.go	72.76% <0.00%> (-4.88%)	⬇️
internal/querynode/flow_graph_delete_node.go	81.25% <0.00%> (-4.17%)	⬇️
internal/mq/mqimpl/rocksmq/client/client_impl.go	76.03% <0.00%> (-4.14%)	⬇️
... and 23 more

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@soothing-rain Please associate the related issue to the body of your Pull Request. (eg. “issue: #6534”)

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[soothing-rain]

rerun ut

[yhmo]

/lgtm

[sre-ci-robot]

New changes are detected. LGTM label has been removed.

[mergify]

@soothing-rain, please be sure the pr should only have one commit, check https://github.com/milvus-io/milvus/blob/master/CODE_REVIEW.md for more details.

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[sre-ci-robot]

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