feat: `associative_vector` rework #135

Job	Run time
Windows-MSVC/2019/Static/X86/Release	3m 45s
Windows-MSVC/2019/Static/X64/Release	3m 16s
Ubuntu/20.04/Static/X64/Release	1m 11s
Ubuntu/22.04/Static/X64/fsanitize	53s
MacOSX/12/Static/X64/Release	1m 34s
	10m 39s

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