Feature/web3 v7 support

[kais92]

Breaking Changes

• Renamed all .rawTransaction properties to .raw_transaction (Web3.py v7 naming).
• Completely refactored middleware for Web3.py v7: now a class-based middleware using wrap_make_request.
• Overhauled FlashbotProvider:
  • Replaced internal Web3 HTTP utils with requests.post.
  • Removed deprecated imports from eth_account._utils.

Added

• Official compatibility with Web3.py v7 (7.x series).
• New helper get_transaction_type() to detect legacy, access list, and EIP-1559 tx types.
• Expanded tests covering _parse_signed_tx for legacy, EIP-2930 (type=1), and EIP-1559 (type=2) transactions.

Fixed

• Ensured numeric RLP fields (bytes) are converted to int.
• Added recovery of chainId for legacy transactions signed under EIP-155.
• Updated examples (examples/simple.py) to use .raw_transaction and new middleware/provider APIs.