create new() methods for VerifirableSecretSharingCommitment and Coeff… #1064

Job	Run time
Rustfmt	17s
Clippy	39s
build with default features	31s
Check if automatically generated code is up to date	24s
test on beta	2m 3s
actionlint	8s
Check Rust doc	33s
	4m 35s

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