enhance: support mmap for jsonstats shared key index

[zhagnlu]

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[sre-ci-robot]

[ci-v2-notice]
Notice: We are gradually rolling out the new ci-v2 system.

• Legacy CI jobs remain unaffected, you can just ignore ci-v2 if you don't want to run it.
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To rerun ci-v2 checks, comment with:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.00%. Comparing base (633cae9) to head (46baaae).
⚠️ Report is 56 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #44914      +/-   ##
==========================================
- Coverage   77.03%   77.00%   -0.03%     
==========================================
  Files        1831     1831              
  Lines      285020   285028       +8     
==========================================
- Hits       219556   219483      -73     
- Misses      58320    58394      +74     
- Partials     7144     7151       +7     

Components	Coverage Δ
Client	78.03% <ø> (ø)
Core	84.01% <100.00%> (+<0.01%)	⬆️
Go	75.08% <ø> (-0.05%)	⬇️

Files with missing lines	Coverage Δ
...nternal/core/src/index/json_stats/JsonKeyStats.cpp	86.98% <100.00%> (+0.02%)	⬆️
...ternal/core/src/index/json_stats/bson_inverted.cpp	98.26% <100.00%> (+0.03%)	⬆️
internal/core/src/index/json_stats/bson_inverted.h	100.00% <ø> (ø)
internal/core/src/storage/DiskFileManagerImpl.cpp	67.30% <100.00%> (+0.31%)	⬆️
internal/core/src/storage/DiskFileManagerImpl.h	66.66% <ø> (ø)

... and 24 files with indirect coverage changes

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