enhance: support null in c data_datacodec and load null value

[smellthemoon]

1. support read and write null in segcore
   will store valid_data(use uint8_t type to save memory) in fieldData.
2. support load null
   binlog reader read and write data into column(sealed segment), insertRecord(growing segment). In sealed segment, store valid_data directly. In growing segment, considering prior implementation and easy code reading, it covert uint8_t to fbvector, which may optimize in future.
3. retrieve valid_data.
   parse valid_data in search/query.
   [Feature]: Support Null and default value #31728

[mergify]

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[codecov]

Codecov Report

Attention: Patch coverage is 75.83187% with 138 lines in your changes missing coverage. Please review.

Project coverage is 80.92%. Comparing base (1f55061) to head (a4835f6).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #32183      +/-   ##
==========================================
- Coverage   80.96%   80.92%   -0.04%     
==========================================
  Files        1185     1180       -5     
  Lines      142715   143366     +651     
==========================================
+ Hits       115544   116018     +474     
- Misses      22760    22917     +157     
- Partials     4411     4431      +20     

Files	Coverage Δ
internal/core/src/common/FieldData.h	100.00% <100.00%> (ø)
internal/core/src/common/FieldMeta.h	94.64% <100.00%> (+0.76%)	⬆️
internal/core/src/common/Schema.h	100.00% <100.00%> (ø)
internal/core/src/common/Vector.h	100.00% <100.00%> (ø)
internal/core/src/index/StringIndexMarisa.cpp	88.81% <100.00%> (-0.14%)	⬇️
internal/core/src/query/SearchOnGrowing.cpp	100.00% <100.00%> (ø)
...nal/core/src/query/groupby/SearchGroupByOperator.h	85.00% <100.00%> (-0.25%)	⬇️
internal/core/src/segcore/ConcurrentVector.h	96.96% <ø> (-1.51%)	⬇️
internal/core/src/segcore/Utils.h	100.00% <ø> (ø)
internal/core/src/segcore/segment_c.cpp	65.72% <100.00%> (-0.59%)	⬇️
... and 28 more

... and 212 files with indirect coverage changes

[sunby]

/lgtm
btw, I plan to add a null bitmap concatenater to merge bitmaps. after that you can replace FixedVector with it.

[congqixia]

/approve

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