Add method for signing multi-sig input #2386

Job	Run time
Clippy (linter)	1m 10s
Clippy (linter)	1m 10s
Clippy (linter)	1m 10s
Build without default features	1m 22s
Build without default features	1m 22s
Build without default features	1m 22s
Check intra-documentation links	2m 10s
Check intra-documentation links	2m 10s
Check intra-documentation links	2m 10s
Test JNI(Android) bindings	10m 29s
Test JNI(Android) bindings	10m 29s
Test JNI(Android) bindings	10m 29s
Test Swift(iOS) bindings	3m 29s
Test Swift(iOS) bindings	3m 29s
Test Swift(iOS) bindings	3m 29s
Run JS tests and publish alpha versions	22m 21s
Run JS tests and publish alpha versions	22m 21s
Run JS tests and publish alpha versions	22m 21s
Code formatting (rustfmt)	18s
Code formatting (rustfmt)	18s
Code formatting (rustfmt)	18s
Tests on ubuntu-latest	4m 2s
Tests on ubuntu-latest	4m 38s
Tests on ubuntu-latest	5m 48s
Code coverage in tests	27m 8s
Code coverage in tests	26m 26s
Code coverage in tests	26m 26s
Tests on windows-latest	4m 2s
Tests on windows-latest	4m 35s
Tests on windows-latest	11m 35s
Tests on macOS-latest	3m 56s
Tests on macOS-latest	4m 33s
Tests on macOS-latest	4m 47s
	4h 11m 53s

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