feat: Add Amoy Testnet configuration to RainbowKit

[dwm13]

*Description:
This pull request adds support for the Amoy Testnet to RainbowKit's chain list.
The configuration includes:

Chain ID: 80002
Network Name: Amoy Testnet
Native Currency: MATIC
RPC URL: https://rpc-amoy.polygon.technology/
Block Explorer: https://amoy.polygonscan.com/
Icon: Polygon's existing ico
```n
*Why:
The Amoy Testnet is an important Sepolia-anchored testnet for Polygon PoS, and including it in RainbowKit ensures developers can easily interact with it using RainbowKit's network selector.
Let me know if additional adjustments are needed.**

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[DanielSinclair]

Thanks!