Provide a ConditionsFormTrait or form element for conditions

Feedback welcome, before starting any kind of implementation, we should have green light from the core maintainers!

In a similar vein to this, I created a number of different modules that make use of conditions in various ways:

Field Visibility Conditions →
Layout Builder Styles Conditions →
Views Access Conditions →

All do similar things with Conditions - adding forms to third party settings, or exposing additional plugins for example, and I found I was recreating the wheel quite a lot.

I ended up just writing my own module with helpers and services necessary to build the forms and evaluate the conditions in various places. All three of those modules were retrofitted to use the helper module. Conditions Helper →

Tagging as we don't have a component.
Kinda related I just created ✨ Conditions should have a flag for ANY/ALL Active