wallets: add [rainbowWallet]

[andrewkimjoseph]

Add Rainbow Wallet to wallet connectors

Description

This PR adds the Rainbow Wallet connector to our list of supported wallets. Rainbow Wallet is a popular Ethereum wallet with a user-friendly interface that will give users more options for connecting to our dApp. The implementation follows our existing pattern for wallet integration.

Other changes

No other changes were made besides adding the Rainbow Wallet to the wallet connectors list.

Tested

• Manually tested the wallet connection flow with Rainbow Wallet
• Verified that the wallet appears correctly in the wallet selection modal
• Confirmed that transactions can be signed and sent through the Rainbow Wallet connector

Related issues

• None

Checklist before requesting a review

• I have performed a self-review of my own code
• I have added unit-tests that prove my fix is effective or that my feature works
• The PR title follows the [conventions](https://www.notion.so/Git-Branching-and-Commit-Message-Conventions-18f66f7d06444cfcbac5725ffbc7c04a?pvs=4#9355048863c549ef92fe210a8a1298aa)
• I have run the [regression tests](https://www.notion.so/Mento-Web-App-Regression-Tests-37bd43a7da8d4e38b65993320a33d557)
• The Smoke Test Run is passed ([how to check the Smoke Test Run job result](https://www.notion.so/mentolabs/How-to-analyze-the-Smoke-Test-Run-1b6a2148cc5c80ec8834f2dd97491680))

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[chapati23]

thank you!

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[chapati23]

let's go