feat(sdk-core): add explicit recipient mode typing for TSS signTxRequest #2452

Job	Run time
Generate merge base API spec	9m 0s
Generate head API spec	8m 27s
Check specs identical	4s
Check breaking changes	-1s
Generate vacuum reports for API spec	-1s
API Spec Check	4s
Linter Override	0s
	17m 33s

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