Extend project with additonal fields

[xla]

To complete the end-to-end integration with the product MVP we need more fields to be stored. Those are metadata fields provided by the user creating the project. For now this is an extension of the Project entity itself until we look more closely into proper metadata storage. It's understood as metadata as there are no guarantees on uniqueness and are complete free-form inputs by the user.

Field changes: (+) name (+) description (=) url -> img_url

• update ledger project registration
• update client project refgistration
• update tests

[rockbmb]

@xla I see - gas limit was crossed because of the increase of data in the Project struct.