feat(sdk-core): add explicit recipient mode typing for TSS signTxRequest #2287

Job	Run time
Generate head API spec	6m 26s
Generate merge base API spec	8m 43s
Check specs identical	6s
Check breaking changes	0s
Generate vacuum reports for API spec	-1s
API Spec Check	4s
Linter Override	-1s
	15m 17s

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