PgClient: Support parsing ssl key and cert paths from connection uri

### Describe the feature

We are using Vert.x via the Micronaut framework where the options and client instantiation is handled by the framework based on declarative configuration. We are using a Postgres connection URI which contains all the necessary details for connecting to our Postgres instance via TLS. According to the documentation, not all connection parameters are supported: https://vertx.io/docs/vertx-pg-client/java/#_connection_uri

From the documentation it looks like this configuration could be supplied via the `PemKeyCertOptions` class but we strongly prefer externalized declarative configuration.

The following parameters are present in our connection URI:

- `sslcert`
- `sslkey`
- `sslrootcert`

Supporting these parameters would make the Vert.x client much easier to configure for certain use cases.

### Contribution

_No response_