Adds new module context flag VALKEYMODULE_CTX_SCRIPT_EXECUTION

[rjd15372]

The new module context flag VALKEYMODULE_CTX_SCRIPT_EXECUTION denotes that the module API function is being called in the context of a scripting engine execution.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.41%. Comparing base (7f8c5b6) to head (16ba309).

Files with missing lines	Patch %	Lines
src/module.c	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           unstable    #2818   +/-   ##
=========================================
  Coverage     72.40%   72.41%           
=========================================
  Files           128      128           
  Lines         70270    70272    +2     
=========================================
+ Hits          50880    50888    +8     
+ Misses        19390    19384    -6     

Files with missing lines	Coverage Δ
src/module.c	9.78% <0.00%> (-0.01%)	⬇️

... and 11 files with indirect coverage changes

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