feat: impl StructArray -- data storage support in segcore

[SpadeA-Tang]

Ref #42148
This PR mainly enables segcore to support array of vector (read and write, but not indexing). Now only float vector as the element type is supported.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.96%. Comparing base (6d2ad51) to head (6d2ad51).
Report is 5 commits behind head on master.

❗ Current head 6d2ad51 differs from pull request most recent head df24a8b

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Additional details and impacted files

@@           Coverage Diff           @@
##           master   #42406   +/-   ##
=======================================
  Coverage   72.96%   72.96%           
=======================================
  Files         335      335           
  Lines       30988    30988           
=======================================
  Hits        22610    22610           
  Misses       8378     8378           

Components	Coverage Δ
Client	∅ <0.00%> (∅)
Core	72.96% <0.00%> (ø)
Go	∅ <0.00%> (∅)

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