Add New Combobox Component

[cirdes]

Description

This PR introduces a new Combobox component to the PhlexUI library. The Combobox component enhances user interaction by allowing them to select from a list of options using filters. This component was inspired by the Shadcn Combobox component and try to adheres to W3C standards for web accessibility.

Features

• Inspired by Shadcn Combobox (reference).
• Implements W3C standards for web accessibility.
• Follows ARIA roles for combobox and listbox to ensure better accessibility.

References

The development of this component was guided by several references to ensure best practices and compliance with accessibility standards:

1. Open UI Combobox Research
2. Open UI Combobox Explainer
3. MDN Web Docs - ARIA Combobox Role
4. MDN Web Docs - ARIA Listbox Role
5. Shadcn Command Component
6. W3C ARIA Combobox Example
7. Deque Labs Combobo Demo
8. Hotwire Combobox
9. Sarah Higley's Article on Comboboxes
10. Stimulus Components

Libraries and Components Consulted

To ensure comprehensive functionality and usability, several existing libraries and components were reviewed:

1. Ant Design Select Component
2. Atlassian Design Select Component
3. Semantic UI Dropdown Component
4. Fluent UI Combobox Component

Screenshots

Additional Notes

The PhlexUI Combobox and the Shadcn Combobox are available to be tested on: https://phlexui-playground.fly.dev/

[cirdes]

@iseth, I have moved combobox.rb to combobox/combobox.rb as you requested!

[SethHorsley]

We need to make a new RBUI module to start the migration to the new gem name.

[SethHorsley]

This is awesome!! Love the new rbui and js syntax