Optimize string operations throughout the codebase #17913

Job	Run time
📊 Static checks / Code style, file formatting, and docs	2m 17s
🍏 iOS / Template (target=template_release)	2m 18s
🏁 Windows / Editor (target=editor, tests=yes)	7m 54s
🤖 Android / Template (target=template_release)	4m 25s
🏁 Windows / Template (target=template_release)	7m 16s
🐧 Linux / Editor w/ Mono (target=editor)	4m 44s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	14m 56s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	5m 54s
🌐 Web / Template (target=template_release)	1m 31s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	6m 7s
🍎 macOS / Editor (target=editor, tests=yes)	5m 45s
🐧 Linux / Template w/ Mono (target=template_release)	2m 35s
🍎 macOS / Template (target=template_release)	36m 9s
🐧 Linux / Minimal template (target=template_release, everything disabled)	2m 8s
🪲 Godot CPP	0s
	1h 43m 59s

Provide feedback