chore: remove live media endpoint

[califlower]

Fixes

remove twilio live media endpoint related to https://code.hq.twilio.com/twilio/api-definitions/pull/4055

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[tiwarishubham635]

Please remove media.rb, media_base.rb and update client.rb like this

[javierlopezfernandez]

I think lib/twilio-ruby/rest/media.rb needs to be removed too

[tiwarishubham635]

This test seems to fail, it says syntax error. Please check

[tiwarishubham635]

LGTM