Allow resizing Strings from GDExtension #7147

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 12s
🤖 Android / Template (target=template_release)	32m 58s
🍎 macOS / Editor (target=editor, tests=yes)	37m 27s
🍎 macOS / Template (target=template_release)	25m 24s
🐧 Linux / Editor w/ Mono (target=editor)	45m 24s
🐧 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)	50m 0s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	46m 10s
🐧 Linux / Template w/ Mono (target=template_release)	32m 10s
🐧 Linux / Minimal template (target=template_release, everything disabled)	27m 18s
🍏 iOS / Template (target=template_release)	23m 36s
🌐 Web / Template (target=template_release)	18m 42s
🏁 Windows / Editor (target=editor, tests=yes)	53m 31s
🏁 Windows / Template (target=template_release)	41m 43s
	7h 15m 35s

Provide feedback