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Implement a faster encoding algoritm for varint #313

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Job	Run time
test-windows	6m 58s
test (net6.0, HWIntrinsics)	47s
test (net6.0, SSSE3)	52s
test (net6.0, BMI2)	44s
test (net6.0, Noop)	50s
test (net8.0, HWIntrinsics)	43s
test (net8.0, SSSE3)	2m 57s
test (net8.0, BMI2)	44s
test (net8.0, Noop)	36s
publish	0s
	15m 11s