feat: explicitly specify column groups for storage v2 api

[shaoting-huang]

• use the new packed reader and writer api to be compatible with current etcd meta
• For the new packed writer API: column groups and paths are explicitly defined by users and won't split column groups by memory in storage v2. Packed writer follows the user-defined column groups to split arrow record and write into the corresponding file path.
• For the new packed reader API: read paths are explicitly defined by users.
  related: [Feature]: storage v2 support #39173

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[codecov]

Codecov Report

Attention: Patch coverage is 81.55340% with 19 lines in your changes missing coverage. Please review.

Project coverage is 81.66%. Comparing base (15c8798) to head (b6b6555).
Report is 57 commits behind head on master.

❗ Current head b6b6555 differs from pull request most recent head f267af7

Please upload reports for the commit f267af7 to get more accurate results.

Files with missing lines	Patch %	Lines
internal/storagev2/packed/packed_writer.go	70.00%	5 Missing and 4 partials ⚠️
internal/storagev2/packed/packed_reader.go	62.50%	3 Missing and 3 partials ⚠️
internal/storagev2/packed/util.go	50.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #39790       +/-   ##
===========================================
+ Coverage   69.39%   81.66%   +12.27%     
===========================================
  Files         302     1187      +885     
  Lines       27077   179033   +151956     
===========================================
+ Hits        18790   146211   +127421     
- Misses       8287    26837    +18550     
- Partials        0     5985     +5985     

Components	Coverage Δ
Client	79.24% <ø> (∅)
Core	∅ <ø> (∅)
Go	81.77% <81.55%> (∅)

Files with missing lines	Coverage Δ
internal/storage/serde_events.go	75.03% <ø> (ø)
internal/storage/serde_events_v2.go	61.71% <100.00%> (ø)
internal/util/initcore/init_core.go	89.60% <100.00%> (ø)
internal/storagev2/packed/util.go	50.00% <50.00%> (ø)
internal/storagev2/packed/packed_reader.go	72.72% <62.50%> (ø)
internal/storagev2/packed/packed_writer.go	78.18% <70.00%> (ø)

... and 1483 files with indirect coverage changes

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