Managing token metadata

Token Metadata can be added / updated and removed as key / value pairs

Retrieving Metadata

println!("\n1. Get Token Metadata");
    println!("=====================");

    let token_info = match client.get_token_metadata(token_address).await {
        Ok(mint_info) => {
            println!("{}", mint_info);
            Some(mint_info)
        }
        Err(e) => {
            print_detailed_error("Could not get token metadata", &e);
            None
        }
    };

Updating Metadata

// 9. Update token metadata
    println!("\n9. Update Token Metadata");
    println!("========================");

    let metadata_payload = TokenMetadataUpdatePayload {
        recent_epoch: state.epoch,
        recent_checkpoint: state.checkpoint,
        chain_id,
        nonce: current_nonce,
        name: "Updated Test Token".to_string(),
        uri: "https://example.com/updated-metadata.json".to_string(),
        additional_metadata: vec![MetadataKVPair {
            key: "version".to_string(),
            value: "2.0".to_string(),
        }],
        token: token_address,
    };

    match client
        .update_token_metadata(metadata_payload, private_key)
        .await
    {
        Ok(response) => {
            println!("Metadata updated - Tx: {}", response.hash);
        }
        Err(e) => {
            print_detailed_error("Could not update token metadata", &e);
        }
    }