Bootstrap 3 port roadmap

Problem/Motivation

List of some features implemented in https://www.drupal.org/project/bootstrap not yet implemented in ui_suite_bootstrap that may be interesting to get. To discuss.

File upload:
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/templates/fi...
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/src/Plugin/P...

Image Widget:
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/templates/fi...
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/src/Plugin/P...

Filter tips:
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/src/Plugin/P...

Message generated by JS:
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/js/misc/mess...

Tabledrag theming:
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/js/misc/tabl...

Sticky table:
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/js/misc/tabl...

Ajax/Dialog :
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/js/misc/ajax.js
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/js/misc/dial...
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/js/dialog.js
Maybe already handled in #3368697: Replace Core modal by Bootstrap's one

Autocomplete:
- https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/js/misc/auto...
Maybe already handled in #3364050: Use spinner component in JS