enhance: Add meta pkg for datacoord

[congqixia]

See also #28861

Add meta package to replace old one in next PRs.

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[congqixia]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 38.40937% with 999 lines in your changes missing coverage. Please review.

Project coverage is 71.91%. Comparing base (3123093) to head (77b8da9). Report is 367 commits behind head on master.

:exclamation: Current head 77b8da9 differs from pull request most recent head 8b8a0a6

Please upload reports for the commit 8b8a0a6 to get more accurate results.

Files with missing lines	Patch %	Lines
internal/datacoord/meta/segment/manager.go	0.00%	238 Missing :warning:
internal/datacoord/meta/segment/batch_operator.go	0.00%	198 Missing :warning:
internal/datacoord/meta/index/index_meta.go	73.40%	151 Missing and 3 partials :warning:
...acoord/meta/partitionstats/partition_stats_meta.go	32.47%	75 Missing and 4 partials :warning:
internal/datacoord/meta/segment/operator.go	9.87%	73 Missing :warning:
internal/datacoord/meta/segment/segment_info.go	30.00%	63 Missing :warning:
internal/datacoord/meta/segment/filter.go	0.00%	51 Missing :warning:
internal/datacoord/meta/segment/types.go	0.00%	46 Missing :warning:
.../datacoord/meta/compaction/compaction_task_meta.go	47.36%	36 Missing and 4 partials :warning:
internal/datacoord/meta/segment/util.go	0.00%	22 Missing :warning:
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #35734      +/-   ##
==========================================
- Coverage   81.59%   71.91%   -9.69%     
==========================================
  Files        1267     1251      -16     
  Lines      150973   149683    -1290     
==========================================
- Hits       123190   107643   -15547     
- Misses      22891    37256   +14365     
+ Partials     4892     4784     -108     

Files with missing lines	Coverage Δ
internal/datacoord/meta/analyze/analyze_meta.go	100.00% <100.00%> (ø)
internal/datacoord/meta/segment/condition.go	0.00% <0.00%> (ø)
internal/datacoord/meta/segment/allocation.go	0.00% <0.00%> (ø)
internal/datacoord/meta/segment/util.go	0.00% <0.00%> (ø)
.../datacoord/meta/compaction/compaction_task_meta.go	47.36% <47.36%> (ø)
internal/datacoord/meta/segment/types.go	0.00% <0.00%> (ø)
internal/datacoord/meta/segment/filter.go	0.00% <0.00%> (ø)
internal/datacoord/meta/segment/segment_info.go	30.00% <30.00%> (ø)
internal/datacoord/meta/segment/operator.go	9.87% <9.87%> (ø)
...acoord/meta/partitionstats/partition_stats_meta.go	32.47% <32.47%> (ø)
... and 3 more

... and 462 files with indirect coverage changes

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