feat: upgrade to v2.0.0 with major dependency updates

- Upgrade Solana dependencies from 2.3.x to 3.0.0 series
  - Upgrade solana-streamer-sdk from 0.4.13 to 0.5.0
  - Upgrade yellowstone-grpc from 8.0.0 to 9.0.0
  - Add new SPL token utility modules (spl_token.rs, spl_token_2022.rs,
  spl_associated_token_account.rs)
  - Remove deprecated gRPC protocol definitions (protos/ directory)
  - Remove event_subscription example and update all example dependencies
  - Update README documentation to reflect v2.0.0 changes
  - Refactor imports to use new dependency structure across examples

  BREAKING CHANGES:
  - Solana SDK upgraded to 3.0.0 with API changes
  - Removed gRPC protocol definitions
  - Updated import paths for SPL token operations

src/instruction/pumpfun.rs

@@ -1,9 +1,8 @@
 use crate::{
-    constants::trade::trade::DEFAULT_SLIPPAGE,
-    trading::core::{
+    common::spl_token::close_account, constants::trade::trade::DEFAULT_SLIPPAGE, trading::core::{
         params::{PumpFunParams, SwapParams},
         traits::InstructionBuilder,
-    },
+    }
 };
 use crate::{
     instruction::utils::pumpfun::{
@@ -18,7 +17,6 @@ use crate::{
 use anyhow::{anyhow, Result};
 use solana_sdk::instruction::AccountMeta;
 use solana_sdk::{instruction::Instruction, pubkey::Pubkey, signer::Signer};
-use spl_token::instruction::close_account;
 
 /// Instruction builder for PumpFun protocol
 pub struct PumpFunInstructionBuilder;