feat(abstract-eth): expose getSignablePayload for ETH coin classes (CGD-1083) #2805

Job	Run time
Generate head API spec	6m 30s
Generate merge base API spec	7m 10s
Check specs identical	6s
API Spec Check	2s
Check breaking changes	-1s
Generate vacuum reports for API spec	-1s
Linter Override	0s
	13m 46s

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