Provide better type hints for combomethod

## What was wrong?

The decorator `combomethod` is widely used in `web3.py`, `eth-account` packages. However, the language server cannot infer the type of the arguments from function wrapped by `combomethod`.

## How can it be fixed?

Use [ParamSpec](https://docs.python.org/3/library/typing.html#typing.ParamSpec) added in python3.10 could fix this problem. As we need to provide support for versions minor to 3.10, we can import ParamSpec from typing-extensions. [Here](https://github.com/microsoft/pylance-release/issues/3142#issuecomment-1207164159) is a good solution.