Allow links without http://

This is not a duplicate. #1778858: Decide on built-in support for internal URLs → might complicate implementing this, and it's been almost ten years so this discussion belongs in core, but i want to briefly raise this issue up first because for decades Drupal has been telling people who enter a web address like a human being does, as browsers have accepted for almost all this time— example.com or www.example.com —that they entered invalid values, when the computer could take on the task of adding the default protocol or even spend a second trying to validate the URL and saving that value, with a message noting what it did. And at least this issue exists to show a few people wanted to treat content editors better!

Seems unlikely that this human-friendliness is going to get into Drupal core easily so opened an issue with Drutopia to work around it: ✨ A person adding an event with a URL who forgets to include the protocol (http/https) has it added for them, with a message that this was done Active