Add a Dropdown Component

[omsai-git]

Description:
I would like to propose adding a Dropdown component to React Native Paper. Currently, React Native Paper provides several UI components like buttons, cards, and text inputs, but there is no dedicated dropdown component. A dropdown is a widely used component in mobile UIs, ideal for allowing users to select from a list of options in a compact form.

Motivation:
Common UI Need: Dropdowns are a standard UI pattern, and adding this feature will help developers save time by avoiding the need for custom implementations.
Consistency with Other UI Libraries: Many other libraries provide a dropdown component, and having one in React Native Paper will offer a more complete set of UI elements.
Enhanced User Experience: Dropdowns can simplify forms by allowing users to make selections from a list of options without cluttering the screen.

Benefits:
Consistency: A dropdown would align with other components in React Native Paper and enhance the overall library.
Time-Saving: Developers can implement dropdowns quickly without having to build custom solutions.
Customization: Allows developers to create flexible and customizable dropdowns suited to their specific needs.

[szado]

Good idea. It's possible to build custom dropdown using Menu and TextInput components but IMHO RNP should offer such basic component out of the box.

[iM-GeeKy]

@omsai-git There is an open pull request for a dropdown component that has yet to be merged.

[omsai-git]

@iM-GeeKy great work. This might fit with the react-native-paper component's design