Add Twilio Sms Notification Provider

[Genc]

• I have read and understand the pull request rules.

Description

You can receive notifications in the form of SMS via Twilio. All you need for this is a Twilio account. (Account SID, Auth Token, Phone Number) You can create a new account here. https://www.twilio.com

Feature Request #2964

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots

[uranderu]

Might I ask why you use "let" for variables you never mutate? Why don't you use "const"?