Use automatic generation of contracts (Wealize#15)

* A bit of tidying up, adding type hinting and better naming

* Refactor with contractsService

* Created TransactionService, 🔥 credentialregistry

* Public key example with new service

* Remove the last hardcoded contract function files

* Improving examples, adding a node envvar, more to come

* Clean old tests

* Updated CHANGELOG

* Updating README with relevant information

* Added codebeautifier link

* Fixing typos

* Remove old hardcoded addresses

* Make it easy to change parser

* Adding a new TODO

* Get addresses from contracts

* Remove config example from root directory

* delegated calls testing

* Examples working fine

* CHANGELOG updated

Updated in pyproject

Version bump

Updated CHANGELOG