Allow setting a default connection override

Issue Summary

We would like to use https://www.twilio.com/docs/usage/webhooks/webhooks-connection-overrides in all our code. We keep accidentally forgetting it. It would be great if we could set a default connection override and if we use the redirect twiml verb that it would automatically append it.

Code Snippet

Instead of writing

const response = new VoiceResponse();
response.redirect({
    method: 'POST'
}, 'https://example.com/foo?query=123#rc=2&ct=1000');

we would like to write

const response = new VoiceResponse({ connectionOverride: 'rc=2&ct=1000' });
response.redirect({
    method: 'POST'
}, 'https://example.com/foo?query=123');

The connection override should also be appended for other things like statusCallbacks in <Gather /> aswell.

Start by tracing the VoiceResponse constructor and the redirect and Gather statusCallback entry points named in the issue. Define how a default connection override is carried and appended, then verify the shown examples and the other Gather statusCallbacks cases.