feat(sdk-core): add EdDSA MPCv2 external signer types and stubs #2558

Job	Run time
Generate merge base API spec	8m 40s
Generate head API spec	8m 1s
Check specs identical	7s
Generate vacuum reports for API spec	0s
API Spec Check	4s
Check breaking changes	0s
Linter Override	0s
	16m 52s

Provide feedback