Replace TokenSerializationType with TokenSerializationTypeVariants #272

Job	Run time
Linux (nightly)	2m 32s
Linux (nightly, --features dummy_match_byte)	3m 13s
Linux (beta)	39s
Linux (beta, --features dummy_match_byte)	32s
Linux (stable)	27s
Linux (stable, --features dummy_match_byte)	25s
Linux (1.63.0)	3m 57s
Linux (1.63.0, --features dummy_match_byte)	3m 55s
Linux (nightly, --features bench)	4m 53s
Linux (nightly, --features bench,dummy_match_byte)	5m 25s
Result	3s
	26m 1s

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