Implement bootstrap5 theme

[nurikk]

Implement bootstrap5 theme

This PR adds support for bootstrap5 theme. It 99.99% copy of bootstrap4 theme, but has following differences:

1. This package depends on react-boostrap v2 (which enables support for bootstrap5) instead of v1
2. This package depends on updated react-icons
3. This package has slight changes in SelectWidget, to support react-boostrap v2

Resolves #2428

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests. I've run npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a description of the PR
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[heath-freenome]

@nurikk Have you considered making this theme use the @rjsf/bootstrap-4 and simply override SelectWidget in the widgets... something like:

import { Theme } from '@rjsf/bootstrap-4';
import SelectWidget from `../src/SelectWidget`;

const Theme5: WithThemeProps = {
  ...Theme,
  widgets: { ...Theme.widgets, SelectWidget }
}

export Theme;

You might keep all of the tests but you won't need most of the source files. Because you are using the latest 2.x version of bootstrap, the imports in the bootstrap-4 version will actually pick up the v2 code as react-bootstrap is a peer-dependency and should supercede things.

[jochenschmich-aeberle]

Hi there, just asking for an indication, whether this pull request is going to be merged?

[heath-freenome]

@jochenschmich-aeberle This PR will likely never be merged as it was made against a now very out-of-date v4 codebase. We are keeping it around as we are considering dropping support for bootstrap-4 in favor of bootstrap-5 when we officially support React 18 as part of the future v6 release. In the meantime, I believe that using the bootstrap-4 theme with bootstrap-5 is possible, assuming you fix the SelectWidget

[johan-smits]

Is there a tracking issue for BS5 implementation?

[heath-freenome]

Is there a tracking issue for BS5 implementation?

@johan-smits Yes, it is #3638

[heath-freenome]

@nurikk We are doing this in v6 with #3974