add create-nullifier (#25) #97

Job	Run time
basic-operations/anchor/create	12m 34s
create-and-update	12m 29s
basic-operations/anchor/close	12m 21s
basic-operations/anchor/create-nullifier	22m 24s
basic-operations/anchor/reinit	12m 48s
basic-operations/anchor/update	12m 22s
basic-operations/anchor/burn	12m 28s
counter/anchor	20m 30s
	1h 57m 56s

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