sqf: Optimize toString for code

[PabstMirror]

Allow optimizing away toString {code} to just the processed code string
e.g. avoid
configProperties [(configFile >> "CfgAmmo" >> _ammo), QUOTE(configName _x == QUOTE(QUOTE(ADDON))), false];

need to verify that this is always safe.
arma will throw error on invalid syntax
toString { a b }
but so will hemtt
is there anyway this could introduce errors?

[codecov]

Codecov Report

❌ Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.3%. Comparing base (8b0b83e) to head (46a1af1).

Files with missing lines	Patch %	Lines
libs/sqf/src/compiler/optimizer/mod.rs	73.9%	6 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
libs/sqf/src/compiler/optimizer/mod.rs	83.7% <73.9%> (-0.7%)	⬇️

... and 2 files with indirect coverage changes

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