chore: set default max gRPC msg size to 64 MB

[whynowy]

Kindly explain what this PR does.

[codecov[bot]]

Codecov Report

Merging #101 (21cc973) into main (f91f881) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #101   +/-   ##
=======================================
  Coverage   97.03%   97.03%           
=======================================
  Files          16       16           
  Lines         775      775           
  Branches       56       56           
=======================================
  Hits          752      752           
  Misses         10       10           
  Partials       13       13           

Impacted Files	Coverage Δ
pynumaflow/_constants.py	100.00% <100.00%> (ø)

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