enhance: add csv support for bulkinsert

[OxalisCu]

See this issue for details: #34937

[sre-ci-robot]

Welcome @OxalisCu! It looks like this is your first PR to milvus-io/milvus 🎉

[bigsheeper]

overall looks good to me

[mergify]

@OxalisCu Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[mergify]

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

[mergify]

@OxalisCu Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[tedxu]

/lgtm

[mergify]

@OxalisCu Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

[codecov]

Codecov Report

Attention: Patch coverage is 72.46696% with 125 lines in your changes missing coverage. Please review.

Project coverage is 81.38%. Comparing base (99f8c64) to head (1e1e57c).
Report is 5 commits behind head on master.

Files	Patch %	Lines
internal/util/importutilv2/csv/row_parser.go	70.70%	51 Missing and 36 partials ⚠️
internal/util/importutilv2/csv/reader.go	71.92%	8 Missing and 8 partials ⚠️
internal/util/testutil/test_util.go	82.92%	7 Missing and 7 partials ⚠️
internal/util/importutilv2/option.go	55.55%	2 Missing and 2 partials ⚠️
internal/util/importutilv2/reader.go	60.00%	1 Missing and 1 partial ⚠️
internal/util/importutilv2/util.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #34938      +/-   ##
==========================================
+ Coverage   72.40%   81.38%   +8.97%     
==========================================
  Files        1234     1236       +2     
  Lines      146916   147370     +454     
==========================================
+ Hits       106374   119932   +13558     
+ Misses      35832    22683   -13149     
- Partials     4710     4755      +45     

Files	Coverage Δ
internal/util/importutilv2/reader.go	69.56% <60.00%> (-2.66%)	⬇️
internal/util/importutilv2/util.go	53.33% <50.00%> (-0.52%)	⬇️
internal/util/importutilv2/option.go	65.95% <55.55%> (-2.47%)	⬇️
internal/util/testutil/test_util.go	93.25% <82.92%> (-1.88%)	⬇️
internal/util/importutilv2/csv/reader.go	71.92% <71.92%> (ø)
internal/util/importutilv2/csv/row_parser.go	70.70% <70.70%> (ø)

... and 238 files with indirect coverage changes

[tedxu]

/lgtm

[congqixia]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, OxalisCu

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