add alchemy plugin

[SahilAujla]

Alchemy Plugin

The Alchemy Plugin provides a set of functions to retrieve on-chain data from the Alchemy API giving your agent the power to work with web3 data. With this plugin, you can fetch portfolio data—including transaction history, token details, NFT information, and NFT contracts—by querying wallet addresses across various supported networks.

Features

• Transaction History: Retrieve historical transactions for a given EVM wallet.
• Tokens by Wallet: Get the tokens held by a wallet along with associated metadata and prices.
• Token Balances by Wallet: Fetch current token balances for a wallet.
• NFTs by Wallet: Retrieve NFTs currently owned by a wallet, with optional paging and metadata.
• NFT Contracts by Wallet: Retrieve distinct NFT contracts (collections) owned by a wallet, including metadata.

[SahilAujla]

@jaimewangvirtuals thank you for reviewing, are we good to merge?

[celesteanglm]

Thanks for the contribution! Could you also add a plugin metadata yml file as per https://github.com/game-by-virtuals/game-node/blob/main/CONTRIBUTION_GUIDE.md#plugin-contribution-guidelines? @SahilAujla

[SahilAujla]

Done @celesteanglm! Ty!

[celesteanglm]

Looks good! Thank you!