feat: add STRUCT level mmap config [2.6]

[SpadeA-Tang]

master: #3036
issue: milvus-io/milvus#42148

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (2.6@ba0a92c). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
pymilvus/orm/schema.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             2.6    #3037   +/-   ##
======================================
  Coverage       ?   45.37%           
======================================
  Files          ?       65           
  Lines          ?    13553           
  Branches       ?        0           
======================================
  Hits           ?     6150           
  Misses         ?     7403           
  Partials       ?        0           

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[XuanYang-cn]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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