Add Logger & Example Run Script

[bh2smith]

This PR

1. Remove strictly pinnned dependencies in favour of >= so more recent python versions and dependencies don't struggle with installation)
2. Adds logger in favour of print statements. Other projects depend on this and can't filter out noisy (undesired print statements from their dependencies).
3. Adds an updated example script (that can be run with python examples/run.py`)
4. Uses primitive types in favour of imports from typing
5. We introduce a utility function fetch_latest_block that is used in the updated example script.

Please let me know if you would prefer I split up some of these changes into independent PRs.

cc @frolvanya

[frolvanya]

Thanks for the contribution!