[UX] Add content title match as search relevancy factor

Is your feature request related to a problem? Please describe.

When searching for content on a Backdrop site, you can put in the EXACT title for a piece of content, but that content will not appear at the top of the search results page. This is because Backdrop does not differentiate between a match in the content title, or anywhere else in the content.

If there is a node with the title "Webform" that does not contain the word "webform" in the body, another node with the word "webform" listed 3 times in the body will rank higher.

Describe the solution you'd like I'd like to be able to weight a title match on the search settings page: admin/config/search/settings

I'd also like it if the title match was set by default to be more important than all the others.

Is there a contributed module that accomplishes this? ...if so, then has this been ported to Backdrop?: https://github.com/backdrop-contrib

The only contrib modules I could find plug in external search tools like ApacheSolr, and I don't think that's within the reach of the average Backdrop user.

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Adding Milesonte Candidate label, hoping for 1.13

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PR: https://github.com/backdrop/backdrop/pull/2499