Feature Request: Add Search Bar to Network Selection Component

[zain171m]

Description

Currently, the network selection component in RainbowKit becomes difficult to navigate when many chains are added to the project. Scrolling through a long list to find a specific network is cumbersome, especially when using multiple testnets, mainnets, and custom chains.

To improve the user experience, I propose adding a search bar to the network selection dropdown. This would enable users to quickly filter and locate networks by typing their name, making the process more efficient.

Proposed Solution

• Add a search bar at the top of the network selection dropdown.
• Dynamically filter the list of networks as users type into the search bar.
• Optionally, introduce sections or categories (e.g., "Mainnets", "Testnets", "Custom Chains") to better organize the networks.

Benefits

1. Enhances user experience by reducing the time needed to find a specific network.
2. Makes the component more scalable for developers who work with a large number of chains.
3. Aligns RainbowKit's interface with modern UI/UX practices for network selection.

Additional Context

• Developers often integrate multiple mainnets, testnets, and custom chains, leading to a cluttered dropdown experience.
• Similar search-based dropdown features are common in other wallet libraries and are widely appreciated for their convenience.

Current UI