Add production Ethereum contracts to benchmark suite

[mokita-j]

Adds production Ethereum contracts (USDC, USDT, WETH9, XEN Crypto) to the benchmark suite for realistic EVM vs PolkaVM performance comparisons.

Changes

New Contracts

• USDC (FiatToken) - proxy + implementation pattern
• USDT (TetherToken) - ERC-20 with transfer operations
• WETH9 - wrapped ETH deposit/withdraw
• XEN Crypto + CoinTool_App - complex token with CREATE2 proxies

Infrastructure

• Library linking support for contracts with dependencies
• PVM code upload utility
• Added contract setup hooks for pre-execution requirements

Usage

Build and benchmark all contracts:

# run geth
geth-dev
# or run revive dev-node
revive_dev_stack

deno task build
./benchmark/contracts.ts --build --execute --report