feat(sdk-core): add EdDSA MPCv2 DSG helpers and DKG key-share util #2504

Job	Run time
Generate head API spec	8m 19s
Generate merge base API spec	8m 35s
Check specs identical	5s
Generate vacuum reports for API spec	-1s
API Spec Check	4s
Check breaking changes	-1s
Linter Override	-1s
	17m 0s

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