New INFO section for scripting engines

[rjd15372]

This commit adds a new INFO section called "Scripting Engines" that shows the information of the current scripting engines available in the server.

Here's an output example:

> info scriptingengines
# Scripting Engines
engines_count:2
engines_total_used_memory:68608
engines_total_memory_overhead:56
engine_0:name=LUA,module=built-in,abi_version=4,used_memory=68608,memory_overhead=16
engine_1:name=HELLO,module=helloengine,abi_version=4,used_memory=0,memory_overhead=40

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.53%. Comparing base (7043c0f) to head (7466f0c).

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2738      +/-   ##
============================================
+ Coverage     72.49%   72.53%   +0.03%     
============================================
  Files           128      128              
  Lines         71624    71647      +23     
============================================
+ Hits          51927    51966      +39     
+ Misses        19697    19681      -16     

Files with missing lines	Coverage Δ
src/scripting_engine.c	54.10% <100.00%> (+0.50%)	⬆️
src/server.c	88.50% <100.00%> (+0.06%)	⬆️

... and 11 files with indirect coverage changes

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[zuiderkwast]

@valkey-io/core-team Please approve or share your thoughts before it gets merged...

[enjoy-binbin]

new info fields LGTM.

though the scriptingengines name is quite long...