MOD-9917 MOD-9918 initial rust result processor bindings and infrastructure

[JonasKruckenberg]

Describe the changes in the pull request

This PR defines the ResultProcessor trait and implements basic infrastructure required for writing result processors in Rust. To make reviewing easier, this PR does not include any result processor implementations and does not impact the redisearch binary at all.

Mark if applicable

• This PR introduces API changes
• This PR introduces serialization changes

[codecov]

Codecov Report

Attention: Patch coverage is 90.74074% with 25 lines in your changes missing coverage. Please review.

Project coverage is 88.86%. Comparing base (5cdd236) to head (ee8b843).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/redisearch_rs/result_processor/src/lib.rs	90.74%	24 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #6250    +/-   ##
========================================
  Coverage   88.85%   88.86%            
========================================
  Files         240      241     +1     
  Lines       40524    40794   +270     
  Branches     3165     3435   +270     
========================================
+ Hits        36008    36251   +243     
- Misses       4481     4507    +26     
- Partials       35       36     +1     

Flag	Coverage Δ
flow	82.21% <ø> (-0.12%)	⬇️
unit	46.33% <90.74%> (+0.29%)	⬆️

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[DarthB]

Please re-add the RPCounter Rust implementation as an example.

[DarthB]

In general LGTM.

outdated

[DarthB]

LGTM