enhance: Support Sparse Embedding

[congqixia]

See also milvus-io/milvus#29419

[sre-ci-robot]

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[codecov]

Codecov Report

Attention: Patch coverage is 69.38776% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 71.89%. Comparing base (ffd629b) to head (37ca3e3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #684      +/-   ##
==========================================
- Coverage   71.95%   71.89%   -0.06%     
==========================================
  Files          50       51       +1     
  Lines        4649     4746      +97     
==========================================
+ Hits         3345     3412      +67     
- Misses       1183     1212      +29     
- Partials      121      122       +1     

Files	Coverage Δ
entity/schema.go	91.79% <ø> (ø)
client/insert.go	78.47% <33.33%> (-1.53%)	⬇️
entity/columns_sparse.go	86.66% <86.66%> (ø)
entity/columns.go	46.66% <0.00%> (-2.07%)	⬇️

[congqixia]

/kind enhancement

[weiliu1031]

/lgtm