Make internal function private

[dirkkul]

the function would be available for auto-complete:

    with collection.batch.dynamic() as batch:
        batch.dynamic_batch_rate_loop()

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.62%. Comparing base (80be3c5) to head (b05a3b0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1049      +/-   ##
==========================================
+ Coverage   94.57%   94.62%   +0.05%     
==========================================
  Files         181      181              
  Lines       18751    18751              
==========================================
+ Hits        17733    17743      +10     
+ Misses       1018     1008      -10     

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