Move simplified Profile module into core

Moving to the ideas queue.

This issue came up in #yes-no-queue. catch pointed out this need produce manager signoff. I am adding the tag.

The issue summary is still pointing to the Drupal 7 version. The 8+ version lives at https://www.drupal.org/project/profile → and has 30,000 users. For me 30,000 users shows that there are plenty of sites that still need this, but I also think they're being served well enough by the contrib module and I'm not sure it's something we need in core - especially in the project browser + recipes world where it will hopefully be more discoverable.

Going through the end of the drupal issue queue came across #1894770: Add views integration for profile2 module → which is postponed on this.

I also agree with catch after reading up on recent history of the issue. It is better in contrib unless there is some major benefit of avoiding duplication in contrib (multiple profile modules competing and there is a need to standardise) or most Drupal sites using it.