Add: Support for KHR_accessor_float64 #447

Job	Run time
build_linux_deprecated_extensions (gcc-9)	3s
build_linux (gcc-9, NO)	2m 6s
build_linux_deprecated_extensions (gcc-10)	12s
build_linux (gcc-10, NO)	2m 29s
build_linux_deprecated_extensions (clang-13)	1s
build_windows (NO)	2m 45s
build_windows_deprecated_extensions	3m 16s
build_linux (gcc-10, YES)	2m 35s
build_windows (YES)	3m 43s
build_linux (clang-13, NO)	2m 12s
build_linux (clang-15, NO)	2m 25s
build_linux (clang-15, YES)	2m 29s
	24m 16s

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