Add extended key property to `SLIP10Node` (#196) #129

Job	Run time
Check workflows	3s
Build, lint, and test / Prepare	16s
Build, lint, and test / Test (16.x)	1m 49s
Build, lint, and test / Test (18.x)	1m 49s
Build, lint, and test / Compatibility test (16.x)	2m 19s
Build, lint, and test / Build	27s
Build, lint, and test / Test (20.x)	1m 33s
Build, lint, and test / Compatibility test (20.x)	2m 1s
Build, lint, and test / Lint	29s
All jobs completed	1s
All jobs pass	1s
is-release	0s
Publish release	0s
	10m 48s

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