enhance: add ScalarFieldProto& overload to avoid unnecessary copies

[zhengbuqian]

1. Array.h: Add output_data(ScalarFieldProto&) overload for both Array and ArrayView classes
2. Use std::string_view instead of std::string for VARCHAR and GEOMETRY types to avoid extra string copies
3. Call Reserve(length_) before writing to proto objects to reduce memory reallocations

a simple test shows those optimizations improve the Array of Varchar bulk_subscript performance by 20%

issue: https://github.com/milvus-io/milvus/issues/45679

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 77.55102% with 11 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 76.48%. Comparing base (8ee8c01) to head (1888370). :warning: Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/core/src/common/Array.h	80.48%	8 Missing :warning:
internal/core/src/mmap/ChunkedColumnGroup.h	0.00%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #45743      +/-   ##
==========================================
- Coverage   76.51%   76.48%   -0.04%     
==========================================
  Files        1875     1875              
  Lines      292559   292602      +43     
==========================================
- Hits       223865   223782      -83     
- Misses      61271    61389     +118     
- Partials     7423     7431       +8     

Components	Coverage Δ
Client	78.17% <ø> (ø)
Core	83.20% <77.55%> (+<0.01%)	:arrow_up:
Go	74.58% <ø> (-0.07%)	:arrow_down:

Files with missing lines	Coverage Δ
internal/core/src/mmap/ChunkedColumn.h	74.36% <100.00%> (-0.17%)	:arrow_down:
internal/core/src/mmap/ChunkedColumnInterface.h	64.70% <ø> (ø)
...rnal/core/src/segcore/ChunkedSegmentSealedImpl.cpp	64.75% <100.00%> (ø)
internal/core/src/mmap/ChunkedColumnGroup.h	44.79% <0.00%> (+0.28%)	:arrow_up:
internal/core/src/common/Array.h	90.62% <80.48%> (-0.22%)	:arrow_down:

... and 32 files with indirect coverage changes

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liliu-z, zhengbuqian

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