Efficient scalar mul and other Scalar improvements #3594

Job	Run time
Build-And-Test-Server (Simple integration tests)	17m 46s
Build-And-Test-Web	5m 22s
Build-And-Test-Server (DEX integration tests)	12m 30s
Build-And-Test-Server (DEX integration test with proofs)	12m 49s
Build-And-Test-Server (Voting integration tests)	5m 25s
Build-And-Test-Server (Unit tests)	19m 17s
Build-And-Test-Server (Verification Key Regression Check)	11m 18s
Build-And-Test-Server (CommonJS test)	2m 44s
Release-on-NPM	0s
Release-mina-signer-on-NPM	0s
	1h 27m 11s

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