feat: Add ability to save protobuf plans to disk for debugging

[andygrove]

Which issue does this PR close?

Related to #1098

Rationale for this change

I would like to be able to save protobuf execution plans to disk and then write benchmarks for deserializing and creating physical plans.

What changes are included in this PR?

WIP

How are these changes tested?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 33.60%. Comparing base (b74bfe4) to head (4197982).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...ain/scala/org/apache/comet/CometExecIterator.scala	16.66%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1099      +/-   ##
============================================
- Coverage     34.33%   33.60%   -0.74%     
+ Complexity      898      866      -32     
============================================
  Files           115      115              
  Lines         42986    42940      -46     
  Branches       9369     9380      +11     
============================================
- Hits          14761    14431     -330     
- Misses        25361    25645     +284     
  Partials       2864     2864              

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