Ethers6 migration

[artman325]

• things that was changed through migration to ethers v6 in tests file
• • contract.address ->contract.target
• • BigNumber -> BigInt
• • await address.getBalance(); -> ethers.provider.getBalance(address);
• • ethers.utils.formatEther -> ethers.formatEther
• • ethers.utils.formatUnits -> ethers.formatUnits
• improved and adapted deploy scripts
• added @nomicfoundation/hardhat-toolbox" @nomicfoundation/hardhat-chai-matchers" and removed unneccesary things