Create Accessibility Options for different types of vision impairments

Many default colors setup in the palettes of widgets, color decorators, default buttons and a variety of areas within the product may not lend itself well to vision impairments like anyone who might be color blind. It would be possible to test our colours against tools that can evaluate this performance and try to ensure that our color scheme can accomodate these kinds of visual impairments.

This could work many ways. It could be:
- A system setting for all in Open for Visual impairment enablement giving a specific colour scheme
- Color limits in selections that are much better view for someone with these visual impairments
- This would be separate from the customization options already in the product.

## Why?
This is an accessibly compliance option inside the product to better support anyone with visual impairments. This will better enable a system wide better visual appearance.

## Your Environment

* Graylog Version: V5
* Elasticsearch Version: 2.0
* MongoDB Version: 6
* Operating System: any
* Browser version: any