Plugin should support Signing Profile ARN and Signing Profile Version ARN

[volphy]

At the moment of writing AWS CLI/Management and other SDK's support the following ARN formats:

• Signing Profile ARN: arn:aws:signer:<AWS_REGION>:<AWS_ACCOUNT_ID>:/signing-profiles/<SIGNING_PROFILE_NAME>"
• Signing Profile Version ARN: arn:aws:signer:<AWS_REGION>:<AWS_ACCOUNT_ID>:/signing-profiles/<SIGNING_PROFILE_NAME>/"

However, AWS Signer Notation Plugin requires different ARN format:

• Signing Profile ARN: arn:aws:signer:<AWS_REGION>:<AWS_ACCOUNT_ID>:/signing-profile/<SIGNING_PROFILE_NAME>"
• Signing Profile Version ARN: arn:aws:signer:<AWS_REGION>:<AWS_ACCOUNT_ID>:/signing-profile/<SIGNING_PROFILE_NAME>/"

It would be the best if the plugin supported the same ARN format as AWS CLI/Management/SDK.