Refactor RAI_getModel/ScriptFromKeyspace

[alonre24]

No need to sent RM_Key to these functions. Update the signatures in redisai.h.

[codecov]

Codecov Report

Merging #573 (620a273) into master (7c82c60) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
- Coverage   74.32%   74.27%   -0.05%     
==========================================
  Files          39       39              
  Lines        6083     6083              
==========================================
- Hits         4521     4518       -3     
- Misses       1562     1565       +3     

Impacted Files	Coverage Δ
src/redisai.h	0.00% <ø> (ø)
src/DAG/dag_builder.c	100.00% <100.00%> (ø)
src/command_parser.c	83.33% <100.00%> (ø)
src/model.c	77.14% <100.00%> (ø)
src/redisai.c	84.12% <100.00%> (ø)
src/script.c	82.50% <100.00%> (ø)
src/background_workers.c	80.55% <0.00%> (-1.39%)	⬇️
src/DAG/dag.c	82.32% <0.00%> (-0.25%)	⬇️

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