fix: split expr.proto file (new)

[kination]

Which issue does this PR close?

Closes #214

Rationale for this change

(Replace #2046)
Split single expr.proto file

What changes are included in this PR?

How are these changes tested?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 57.77%. Comparing base (f09f8af) to head (1cd4e18).
⚠️ Report is 433 commits behind head on main.

Files with missing lines	Patch %	Lines
.../scala/org/apache/comet/serde/QueryPlanSerde.scala	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2267      +/-   ##
============================================
+ Coverage     56.12%   57.77%   +1.64%     
- Complexity      976     1291     +315     
============================================
  Files           119      145      +26     
  Lines         11743    13360    +1617     
  Branches       2251     2378     +127     
============================================
+ Hits           6591     7719    +1128     
- Misses         4012     4384     +372     
- Partials       1140     1257     +117     

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[comphead]

Thanks @kination thats LGTM waiting CI