Integrate Metaplex DAS API

[dimitrov-d]

Pull Request Description

This PR implements the Metaplex DAS API to the Solana Agent Kit

Changes Made

This PR adds the following new tools and actions:

• Get Asset by ID
• Get Assets by Authority
• Get Assets by Creator
• Search/Lookup Assets by different criteria

Implementation Details

• The actions and tools are implemented to their respective files in the metaplex/ folders of actions, tools and langchain directories.
• The actions were added as part of the SolanaAgentKit class and exported under createSolanaTools function.
• The actions utilize the @metaplex-foundation/digital-asset-standard-api SDK.

Prompt Used

prompts.txt

Checklist

• I have tested these changes locally
• I have updated the documentation
• I have added the prompt used to test it

[dimitrov-d]

Resolved conflicts to be compatible with version 1.4.1

[thearyanag]

hey @dimitrov-d - can you pls attach an SS showing it's working with langchain prompts

[dimitrov-d]

@thearyanag Here you go! I also attached some example prompts in a text file in the PR description