Add `mnemonicToEntropy` function #148

Job	Run time
Check workflows	4s
Build, lint, and test / Prepare	13s
Build, lint, and test / Lint	36s
Build, lint, and test / Compatibility test (16.x)	3m 13s
Build, lint, and test / Compatibility test (20.x)	2m 56s
Build, lint, and test / Build	30s
Build, lint, and test / Test (16.x)	2m 52s
Build, lint, and test / Test (18.x)	2m 52s
Build, lint, and test / Test (20.x)	2m 36s
All jobs completed	0s
All jobs pass	1s
is-release	0s
Publish release	0s
	15m 53s

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