Make it super easy to change contract and account addresses for ERC calls

[kantagara]

Summary Create a scriptable object class that will contain ALL the configuration information for all of the ERC protocols, so that people can easily just change the information themselves and they can easily use our samples. Put the default scriptable object in the resources folder, and use it in all of the ERCXXXXX calls.

Motivation Easy switching of smart contract addresses from one chain to the other without much of a hassle from the end users.

Acceptance Criteria

• [ ] Scriptable object class exists
• [ ] Scriptable object instance is under Resources
• [ ] All samples are using that same scriptable object instance.