Support LoadPartial interface for DataKV

[longjiquan]

Signed-off-by: dragondriver jiquan.long@zilliz.com
/kind enhancement
/cc @czs007
issue: #9535

[codecov]

Codecov Report

Merging #9554 (be8491c) into master (d0bc0cd) will increase coverage by 0.06%.
The diff coverage is 70.96%.

@@            Coverage Diff             @@
##           master    #9554      +/-   ##
==========================================
+ Coverage   80.05%   80.12%   +0.06%     
==========================================
  Files         248      248              
  Lines       45627    45658      +31     
==========================================
+ Hits        36528    36582      +54     
+ Misses       7030     7012      -18     
+ Partials     2069     2064       -5     

Impacted Files	Coverage Δ
internal/kv/minio/minio_kv.go	78.97% <70.00%> (-1.16%)	⬇️
internal/kv/mem/mem_kv.go	53.52% <72.72%> (+1.61%)	⬆️
internal/datacoord/segment_manager.go	84.39% <0.00%> (-1.07%)	⬇️
internal/datacoord/cluster.go	81.40% <0.00%> (-0.73%)	⬇️
internal/proxy/impl.go	81.35% <0.00%> (-0.24%)	⬇️
internal/rootcoord/meta_table.go	81.02% <0.00%> (+0.20%)	⬆️
...ternal/util/rocksmq/server/rocksmq/rocksmq_impl.go	76.63% <0.00%> (+0.67%)	⬆️
internal/distributed/rootcoord/client/client.go	92.25% <0.00%> (+0.70%)	⬆️
internal/querycoord/querynode.go	65.30% <0.00%> (+0.81%)	⬆️
internal/rootcoord/task.go	82.23% <0.00%> (+0.85%)	⬆️
... and 5 more

[czs007]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, DragonDriver

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