Link field doesn't sufficiently validate input

Problem/Motivation

Currently, In default link field we have URL and Link text.
URL field accepts multiple URLs, which leads to creating broken URL in the node view page.

e.g. I can add 2 urls same time https://www.google.com, https://www.google.in
and in node view, it comes as https://www.google.com%2C%20https//www.google.in

See attached images:

Steps to reproduce

1. Add a Link Field to a content type allow one value
2. Add a node of that content type and in the Link field add two Urls separated by a comma, for example, https://www.google.com, https://www.google.in.
3. Save - notice no errors

Proposed resolution

Validate the field using UrlElement::validateUrl()

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet