Allow to set database parameters for external databases

If our external database needs an special parameter, for example "useSSL=true", the only way to set this parameter is via the JDBC URL, which is not working fine when using a MySQL and MariaDB (see issue: RHPAM-2764).

However, we also can configure our external database setting the HOST and PORT, so we would like to have a new setting to configure these parameters.

For example, this is our JDBC URL: jdbc:mysql:mysql-57.hosts.prod.upshift.rdu2.redhat.com:3306/dballo02?useSSL=false. Using the HOST and PORT:

• In Templates:

RHPAM_SERVICE_HOST: mysql-57.hosts.prod.upshift.rdu2.redhat.com
RHPAM_SERVICE_PORT: 3306
RHPAM_DATABASE: dballo02

• In Operators:

.Database.ExternalConfig.Host: mysql-57.hosts.prod.upshift.rdu2.redhat.com
.Database.ExternalConfig.Port: 3306
.Database.ExternalConfig.Name: dballo02

Missing how to set the useSSL=false in both.