Crossmint Balance API Plugin

[filipposl]

Background

Adds a new balance plugin for Crossmint wallets to fetch token balances using the Crossmint API.

What does this PR do?

• Implements a token balance plugin for Crossmint wallets
• Adds support for querying token balances across different chains

Testing

Detailed testing results

Method	Prompt	Screenshot	Transaction Link
Action #1	Fetch my USDC and ETH balance on base-sepolia		Transaction link

Docs

For plugins

• [*] I have tested this change locally with key pair wallets
• [*] I have tested this change locally with hosted wallets (e.g. Crossmint Smart Wallets, etc.)
• [*] Package exists in the goat workspace file

Discord username

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Latest commit: 74bdd27

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