feat: add Monad and Monad Testnet support

[snubeaver]

Description

Adds support for the Monad chain (Chain ID 143) and Monad Testnet (Chain ID 10143).

Changes:

• Added USDC configuration for Monad and Monad Testnet.
• Imported monad and monadTestnet chains from viem/chains.
• Updated NetworkSchema and mappings to support monad and monad-testnet.

Tests

Verified changes by running the following commands in the typescript directory:

• npm test: All 250 tests passed across 18 test files.
• npm run build: Build completed successfully, ensuring type safety.
• npm run lint:check: No linting errors.
• npm run format:check: Code is correctly formatted.

Checklist

• I have formatted and linted my code
• All new and existing tests pass
• My commits are signed (required for merge) -- you may need to rebase if you initially pushed unsigned commits

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

[vercel]

Someone is attempting to deploy a commit to the Coinbase Team on Vercel.

A member of the Team first needs to authorize it.

[erikreppel-cb]

@snubeaver lgtm but you need to sign your commits

[snubeaver]

@snubeaver lgtm but you need to sign your commits

Have verified the commits! thanks