Add model_normal_matrix for fragment shader #547

Job	Run time
📊 Static checks / Code style, file formatting, and docs	2m 41s
🍏 iOS / Template (target=template_release)	12m 20s
🤖 Android / Template (target=template_release)	29m 34s
🍎 macOS / Editor (target=editor, tests=yes)	1m 48s
🐧 Linux / Editor w/ Mono (target=editor)	36m 57s
🍎 macOS / Template (target=template_release)	1m 33s
🌐 Web / Template (target=template_release)	24m 32s
🐧 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)	35m 16s
🏁 Windows / Editor (target=editor, tests=yes)	44m 4s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	34m 10s
🏁 Windows / Template (target=template_release)	32m 3s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	28m 48s
🐧 Linux / Template w/ Mono (target=template_release)	24m 35s
🐧 Linux / Minimal template (target=template_release, everything disabled)	15m 23s
🪲 Godot CPP / Build and test Godot CPP	7m 20s
	5h 31m 4s

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