Efficient scalar mul and other Scalar improvements #3611

Job	Run time
Build-And-Test-Web	5m 43s
Build-And-Test-Server (Simple integration tests)	18m 8s
Build-And-Test-Server (DEX integration tests)	12m 38s
Build-And-Test-Server (DEX integration test with proofs)	12m 58s
Build-And-Test-Server (Voting integration tests)	5m 29s
Build-And-Test-Server (Unit tests)	38m 39s
Build-And-Test-Server (Verification Key Regression Check)	11m 39s
Build-And-Test-Server (CommonJS test)	2m 52s
Release-on-NPM	2m 4s
Release-mina-signer-on-NPM	2m 15s
	1h 52m 25s

Provide feedback