Add private exponent and token attributes to RSA KeyAttributesMap in ImportKey sample

[nikran-amzn]

Issue #, if available: The RSA Private Key import sample was missing the PRIVATE_EXPONENT attribute in order to successfully import into the HSM.

Description of changes:

• Added the PRIVATE_EXPONENT attribute to the RSA KeyAttributesMap for import
• Added TOKEN attribute to specify that this import will be ephemeral

Testing

openssl genrsa -out rsa_private_key.pem -f4 2048
openssl rsa -in rsa_private_key.pem -noout -check
openssl pkcs8 -topk8 -in rsa_private_key.pem -inform pem -out rsa_private_key_pkcs8.pem -outform pem -nocrypt
openssl rsa -in rsa_private_key_pkcs8.pem -noout -check
java -ea -Djava.library.path=/opt/cloudhsm/lib/ -cp ".:/opt/cloudhsm/java/*" -jar target/assembly/key-utility-runner.jar --import-rsa-pem rsa_private_key_pkcs8.pem

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