Tests

feat: Add vrf_fun crate #927

Job	Run time
Rustfmt	13s
build	21s
clippy_check	22s
test (x86_64-unknown-linux-gnu)	57s
test (armv7-unknown-linux-gnueabihf)	1m 53s
test-nightly	27s
test-minimal (schnorr_fun)	1m 11s
test-minimal (ecdsa_fun)	1m 3s
doc-build	18s
test-minimal (secp256kfun)	1m 17s
test-alloc (sigma_fun)	47s
test-minimal (sigma_fun)	44s
test-alloc (ecdsa_fun)	1m 3s
test-alloc (schnorr_fun)	1m 20s
test-alloc (secp256kfun)	1m 18s
	13m 14s

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