Scripting Engine Debugger Support

[rjd15372]

This PR introduces the support for implementing remote debuggers in scripting engines modules.

The module API is extended with scripting engines callbacks and new functions that can be used by scripting engine modules to implement a remote debugger.

Most of the code that was used to implement the Lua debugger, was refactored and moved to the scripting_engine.c file, and only the code specific to the Lua engine, remained in the debug_lua.c file.

The SCRIPT DEBUG (YES|NO|SYNC) command was extend with an optional parameter that can be used to specify the engine name, where we want to enable the debugger. If no engine name is specified, the Lua engine is used to keep backwards compatibility.

In src/valkeymodule.h we see the module API changes. And in the helloscripting.c file we can see how to implement a simple debugger for the dummy HELLO scripting engine.

[codecov]

Codecov Report

Attention: Patch coverage is 46.49682% with 336 lines in your changes missing coverage. Please review.

Project coverage is 71.04%. Comparing base (3828936) to head (fcee5d6).
Report is 2 commits behind head on unstable.

Files with missing lines	Patch %	Lines
src/scripting_engine.c	49.14%	207 Missing ⚠️
src/lua/debug_lua.c	40.14%	85 Missing ⚠️
src/eval.c	41.66%	14 Missing ⚠️
src/module.c	22.22%	14 Missing ⚠️
src/valkey-cli.c	0.00%	9 Missing ⚠️
src/lua/engine_lua.c	76.00%	6 Missing ⚠️
src/server.c	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1701      +/-   ##
============================================
- Coverage     71.10%   71.04%   -0.06%     
============================================
  Files           123      123              
  Lines         65523    65790     +267     
============================================
+ Hits          46590    46742     +152     
- Misses        18933    19048     +115     

Files with missing lines	Coverage Δ
src/commands.def	100.00% <ø> (ø)
src/server.c	87.54% <66.66%> (ø)
src/lua/engine_lua.c	86.63% <76.00%> (-1.65%)	⬇️
src/valkey-cli.c	55.74% <0.00%> (-0.08%)	⬇️
src/eval.c	86.21% <41.66%> (-2.46%)	⬇️
src/module.c	9.64% <22.22%> (+0.04%)	⬆️
src/lua/debug_lua.c	35.73% <40.14%> (-3.55%)	⬇️
src/scripting_engine.c	55.06% <49.14%> (-20.80%)	⬇️

... and 13 files with indirect coverage changes

[madolson]

Postponing until 9.0.