New connections modal

[dfalbel]

Addresses #5687

First steps towards modals for creating new connections.

TODO

• Extend the Driver interface with supported input types
• UI for displaying the connection input values/managing the connections code
• Improve the radio buttons behavior when options is not specified
• Implement a first pass on generateCode that takes Inputs and returns code.
• Implement the Connect button behavior
• Back should preserve the selected interpreter.

Follow up issues

• Mechanism for extending the registration of Connections Drivers #5689

QA Notes

[softwarenerd]

Something to look into. There is inconsistent use of:

(() => localize('positron.newConnectionModalDialog.title', "Create New Connection"))() 

vs:

localize('positron.newConnectionModalDialog.title', "Create New Connection")

We've had some problems with embedding localize calls in JSX in production builds.

[dfalbel]

Thank you, I have updated the localize calls in 69b83d4