feat: Enhance Solana tools with action-based architecture

- Introduced action system for Solana tools, allowing for better modularity and maintainability.
- Updated SolanaBalanceTool, SolanaTransferTool, SolanaDeployTokenTool, SolanaDeployCollectionTool, SolanaMintNFTTool, SolanaTradeTool, and SolanaRequestFundsTool to utilize action handlers.
- Added new action exports in index.ts for better organization and accessibility.

src/actions/mintNFT.ts

@@ -0,0 +1,88 @@
+import { PublicKey } from "@solana/web3.js";
+import { Action } from "../types/action";
+import { SolanaAgentKit } from "../agent";
+import { z } from "zod";
+
+const mintNFTAction: Action = {
+  name: "solana_mint_nft",
+  similes: [
+    "mint nft",
+    "create nft",
+    "mint token",
+    "create token",
+    "add nft to collection"
+  ],
+  description: `Mint a new NFT in a collection on Solana blockchain.`,
+  examples: [
+    [
+      {
+        input: {
+          collectionMint: "J1S9H3QjnRtBbbuD4HjPV6RpRhwuk4zKbxsnCHuTgh9w",
+          name: "My NFT",
+          uri: "https://example.com/nft.json"
+        },
+        output: {
+          status: "success",
+          message: "NFT minted successfully",
+          mintAddress: "7nE9GvcwsqzYxmJLSrYmSB1V1YoJWVK1KWzAcWAzjXkN",
+          metadata: {
+            name: "My NFT",
+            uri: "https://example.com/nft.json"
+          },
+          recipient: "7nE9GvcwsqzYxmJLSrYmSB1V1YoJWVK1KWzAcWAzjXkN"
+        },
+        explanation: "Mint an NFT to the default wallet"
+      }
+    ],
+    [
+      {
+        input: {
+          collectionMint: "J1S9H3QjnRtBbbuD4HjPV6RpRhwuk4zKbxsnCHuTgh9w",
+          name: "Gift NFT",
+          uri: "https://example.com/gift.json",
+          recipient: "9aUn5swQzUTRanaaTwmszxiv89cvFwUCjEBv1vZCoT1u"
+        },
+        output: {
+          status: "success",
+          message: "NFT minted successfully",
+          mintAddress: "8nE9GvcwsqzYxmJLSrYmSB1V1YoJWVK1KWzAcWAzjXkM",
+          metadata: {
+            name: "Gift NFT",
+            uri: "https://example.com/gift.json"
+          },
+          recipient: "9aUn5swQzUTRanaaTwmszxiv89cvFwUCjEBv1vZCoT1u"
+        },
+        explanation: "Mint an NFT to a specific recipient"
+      }
+    ]
+  ],
+  schema: z.object({
+    collectionMint: z.string().min(32, "Invalid collection mint address"),
+    name: z.string().min(1, "Name is required"),
+    uri: z.string().url("URI must be a valid URL"),
+    recipient: z.string().min(32, "Invalid recipient address").optional()
+  }),
+  handler: async (agent: SolanaAgentKit, input: Record<string, any>) => {
+    const result = await agent.mintNFT(
+      new PublicKey(input.collectionMint),
+      {
+        name: input.name,
+        uri: input.uri,
+      },
+      input.recipient ? new PublicKey(input.recipient) : agent.wallet_address
+    );
+
+    return {
+      status: "success",
+      message: "NFT minted successfully",
+      mintAddress: result.mint.toString(),
+      metadata: {
+        name: input.name,
+        uri: input.uri
+      },
+      recipient: input.recipient || result.mint.toString()
+    };
+  }
+};
+
+export default mintNFTAction;