Add support for font-feature-settings CSS property

[admrulankor]

Prerequisites

• [x] I have searched for duplicate or closed feature requests
• [X] I have read the contributing guidelines

Proposal

There should be support for the font-feature-settings CSS property in Bootstrap so that stylistic sets can be implemented with ease

Motivation and context

I already tried to implement font-feature-settings with a customized Bootstrap implementation to no avail, while I want to use a stylistic set of a certain font