Feat/add disabled prop to combobox

[tcoile]

todo:

• finish disabled example
• what happens with mobile / textbox blur / etc events?

[tcoile]

beta-release-bot: viz

[github-actions]

Release packages (viz): Succeeded ✅

To install, run npm install @mathstack/[email protected]

[stephanietuerk]

@tcoile We've successfully disabled the combobox from the outside previously, and that was the path that we wanted to go with this.

The state focus combobox in Scorecard has an example of a disabled combobox.

We want to be very intentional about what we add to our library components. Can that solution work here as well?