Move `get_event_data` and `get_function_info` from web3._utils modules to Public API

### What was wrong?
Breaking changes were made to utility functions depended upon for client application functionality, making version updates more difficult.

### How can it be fixed?
Python clients are using utility functions such as `get_event_data` and `get_function_info` extensively to interact with the blockchain. Given their utility to clients, these functions should be moved out of the `_utils` module and made public to ensure API stability across non-major releases.