Allow additional HikariCP properties to be passed via PooledConnectionFactoryConfiguration

Currently the only way to provide additional HikariCP configuration is via a `hikari.properties` file. We should allow users to enter these properties via our xml/config builders.

This will also benefit the new datagrid-infinispan-datasources subsystem, as it will allow users to continue to utilise many of the additional tuning options that we have inherited from the wildfly-connector subsystem.