Allow customising ClientOptions when creating a new client

[jorgelc]

At the moment, the client options are created only from the connection URI.

This means that only connection string options can be used.

It would be interesting to pass custom ClientOptions when creating a new client, allowing settings not available in the connection string (such as ServerAPIOptions).

[jorgelc]

In case it is of any use, I have added a draft implementation in this PR #30