`Web3ExternalProvider` Should Support Configuration of Selected Transport Mechanism

[luu-alex]

The Web3ExternalProvider constructor allows developers to select the transport type, but this option is limited to either HTTPS or WebSocket and does not provide developers with the ability to configure the selected transport mechanism (e.g. HTTP provider configuration, WebSocket provider configuration). The Web3ExternalProvider class should support configuration of the chosen transport mechanism.

[danforbes]

@luu-alex - I have updated the title and description of this Issue to add more details. Can you please confirm that my understanding of your feature request is correct?

[danforbes]

@jdevcs can you sanity-check the documentation for this change?