breaking Drops support for Node.js less than version 14.
breaking Updates @twilio/cli-core to version 7
Switches out @oclif/command and @oclif/config for @oclif/core.
Updates ./bin/run and commands/watch.js to use @oclif/core.
Adds new ./bin/dev script for debug running locally.
Adds src/index.js and main property in package.json.