feat(sdk-core): add explicit recipient mode typing for TSS signTxRequest #2471

Job	Run time
Generate merge base API spec	8m 37s
Generate head API spec	7m 14s
Check specs identical	5s
Check breaking changes	0s
Generate vacuum reports for API spec	0s
API Spec Check	5s
Linter Override	-1s
	16m 0s

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