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Creates a SignerKey from an encoded signer key string.
This method automatically detects the signer key type based on the encoded string format and creates the appropriate SignerKey instance.
Return
A new SignerKey instance
Parameters
encoded
The StrKey-encoded signer key string
Throws
if encodedSignerKey is not a well-formed strkey of one of the four signer key forms. It is the only exception this function raises: a signed payload is checked against the framing it declares before any byte that framing names is read. A string written under the character a signed payload carries and as long as one is refused for the rule it broke; every other input is refused by naming itself.