User-configurable gpuav indices_count #15797

Job	Run time
code-format	35s
windows	0s
all-tests-passed	2s
check_vvl	-1s
androidOnLinux	0s
linux (thread sanitizer, ${{ matrix.config }}, custom_hash_map ${{ matrix.custom_hash_map }} )	0s
linux (address sanitizer, ${{ matrix.config }}, custom_hash_map ${{ matrix.custom_hash_map }} )	0s
chromium	0s
windowsUpload	0s
android	0s
linux Upload	0s
mingw	0s
linux (undefined behavior sanitizer, debug)	0s
iOS	0s
Ubuntu Backcompat	0s
androidUpload	0s
	36s

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