Ozone serialization codec for Ozone S3 secret table

HDDS-748/HDDS-864 introduced an option to use strongly typed metadata tables and separated the serialization/deserialization logic to separated codec implementation

HDDS-937 introduced a new S3 secret table which is not codec based.

I propose to use codecs for this table.

In OzoneMetadataManager the return value of getS3SecretTable() should be changed from Table<byte[],byte[]> to Table<S3SecretKey,S3SecretValue>.

The encoding/decoding logic of S3SecretValue should be registered in ~OzoneMetadataManagerImpl:L204

As the codecs are type based we may need a wrapper class to encode the String kerberos id with md5: class S3SecretKey(String name = kerberodId). Long term we can modify the S3SecretKey to support multiple keys for the same kerberos id.