Support storing secrets that include newlines

[keirlawson]

Secrets such as private keys contain newlines, at present there appears to be no way to store such secrets with the KISS CLI. I have tried both piping in from standard input (results in only the first line being stored) and replacing newlines with \n (gives [ERROR] failed to read input from stdin. Either -value is required or you provided an invalid input)

[RileyWilliams]

#45 addresses this

[kkonstan-ovo]

Unless I'm missing something, create-from addresses the issue when creating secrets, but not when updating them, that would require an equivalent update-from.

As a workaround I have to delete/create things now.