Add data structures + contract types to ERC3K.js

[Evalir]

We should add the main data structures / contract types of Govern to ERC3K.js, so we can easily both receive and send actions, containers, collaterals, and so on.

[Evalir]

Re-assigned this task; I'll be working on the console and probably the discord bot through the week, so it might make sense for the API / DX team to get on this task.

[nivida]

As discussed are we able to close this issue. The structure of the project changed and the erc3k.js lib is no longer required. Those functionalities will be moved out to a core package from the govern-server package.

@bpierre Feel free to elaborate on our decision further here.

[bpierre]

Yes let’s close it since it was about ERC3K.js as a prototype.

[nivida]

New Issue: #61