Tests

[❄] Add SignatureShare type alias #844

Job	Run time
doc-build	27s
clippy_check	20s
build	2m 7s
Rustfmt	14s
test (x86_64-unknown-linux-gnu)	1m 42s
test-alloc (secp256kfun)	52s
test (armv7-unknown-linux-gnueabihf)	7m 11s
test-minimal (secp256kfun)	51s
test-alloc (sigma_fun)	14s
test-nightly	1m 30s
test-minimal (sigma_fun)	22s
test-alloc (ecdsa_fun)	41s
test-minimal (ecdsa_fun)	36s
test-alloc (schnorr_fun)	53s
test-minimal (schnorr_fun)	40s
	18m 40s

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