perf: add support for batched scope access

[jpnurmi]

Keep the scope read or write lock across a batch while allowing the owning thread to use existing scope accessors without relocking.

This tackles two use-cases:

• Atomic reads of multiple scope properties: don't allow writes from other threads to intervene to ensure consistent data
• Batched writes of multiple scope properties: one backend flush at the end can result in huge wins in terms of performance

[cursor]

Stale Bugbot comment from a previous run.

[codecov]

Codecov Report

❌ Patch coverage is 90.07092% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.14%. Comparing base (6b0d5f0) to head (2c04bee).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2107      +/-   ##
==========================================
- Coverage   75.15%   75.14%   -0.02%     
==========================================
  Files         103      103              
  Lines       27930    28050     +120     
  Branches     5094     5112      +18     
==========================================
+ Hits        20990    21077      +87     
- Misses       5596     5624      +28     
- Partials     1344     1349       +5     

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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