refactor(proto): migrate RepartitionExec serde

[buraksenn]

Which issue does this PR close?

• Closes Proto: migrate RepartitionExec #23504.

Rationale for this change

Part of epic #23494. Moves RepartitionExec protobuf serialization from central dispatch.

What changes are included in this PR?

Add new proto functions in physical plan and deprecate proto ones.

Are these changes tested?

Yes, existing round trip tests pass.

Are there any user-facing changes?

Existing methods are deprecated with no immediate API change.

[github-actions]

Thank you for opening this pull request!

Reviewer note: cargo-semver-checks reported the current version number is not SemVer-compatible with the changes in this pull request (compared against the base branch).

Details

     Cloning apache/main
    Building datafusion-physical-plan v54.1.0 (current)
       Built [  39.689s] (current)
     Parsing datafusion-physical-plan v54.1.0 (current)
      Parsed [   0.143s] (current)
    Building datafusion-physical-plan v54.1.0 (baseline)
       Built [  37.317s] (baseline)
     Parsing datafusion-physical-plan v54.1.0 (baseline)
      Parsed [   0.142s] (baseline)
    Checking datafusion-physical-plan v54.1.0 -> v54.1.0 (no change; assume patch)
     Checked [   0.611s] 223 checks: 223 pass, 30 skip
     Summary no semver update required
    Finished [  79.372s] datafusion-physical-plan
    Building datafusion-proto v54.1.0 (current)
       Built [  59.906s] (current)
     Parsing datafusion-proto v54.1.0 (current)
      Parsed [   0.019s] (current)
    Building datafusion-proto v54.1.0 (baseline)
       Built [  60.935s] (baseline)
     Parsing datafusion-proto v54.1.0 (baseline)
      Parsed [   0.024s] (baseline)
    Checking datafusion-proto v54.1.0 -> v54.1.0 (no change; assume patch)
     Checked [   0.226s] 223 checks: 222 pass, 1 fail, 0 warn, 30 skip

--- failure trait_method_marked_deprecated: trait method #[deprecated] added ---

Description:
A trait method is now #[deprecated]. Downstream crates will get a compiler warning when using this method.
        ref: https://doc.rust-lang.org/reference/attributes/diagnostics.html#the-deprecated-attribute
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.49.0/src/lints/trait_method_marked_deprecated.ron

Failed in:
  method try_into_repartition_physical_plan in trait datafusion_proto::physical_plan::PhysicalPlanNodeExt in /home/runner/work/datafusion/datafusion/datafusion/proto/src/physical_plan/mod.rs:720
  method try_from_repartition_exec in trait datafusion_proto::physical_plan::PhysicalPlanNodeExt in /home/runner/work/datafusion/datafusion/datafusion/proto/src/physical_plan/mod.rs:720

     Summary semver requires new minor version: 0 major and 1 minor checks failed
    Finished [ 122.398s] datafusion-proto

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.00000% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.69%. Comparing base (5de7f1d) to head (fa3b17b).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
datafusion/physical-plan/src/repartition/mod.rs	77.03%	14 Missing and 17 partials ⚠️
datafusion/proto/src/physical_plan/mod.rs	6.66%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23792      +/-   ##
==========================================
- Coverage   80.71%   80.69%   -0.02%     
==========================================
  Files        1089     1089              
  Lines      368760   368878     +118     
  Branches   368760   368878     +118     
==========================================
+ Hits       297647   297680      +33     
- Misses      53372    53436      +64     
- Partials    17741    17762      +21     

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