Integrate OCI ATP with MP DataSource

[arjav-desai]

This is a follow-up to #3072. As seen in the example https://github.com/oracle/helidon/tree/master/examples/integrations/oci/atp-cdi, once user gets the wallet, they still have to do a lot in order to config DataSource/ConnectionPool with wallet info.

It would be very user friendly, if we can take info/config e.g.
oracle.ucp.helidon.AtpDataSource.test.service=helidon_atp_high oracle.ucp.helidon.AtpDataSource.test.user=testUser oracle.ucp.helidon.AtpDataSource.test.password=testPassword
When this test datasource is injected and connection is retrieved from it, we can figure out the jdbc url as well as get wallet without user needing to do so.