update backend to work with protocol v2

[sirpy]

• new contracts from @gooddollar/goodprotocol
• fish from new ubi
• feature toggle based on env
• fake interest for dev/qa envs

[vldkh]

@sirpy After creating a new account via the invite link - there are a lot of similar errors appear.

Environment: QA 1.30.1-8

Devices: Windows 10 // Google Chrome v92

Attachments: https://www.screencast.com/t/jUX6zKIRDJf

[sirpy]

@vldkh please retest

[vldkh]

@sirpy @lukasz-kilaszewski @johnsmith-gooddollar checked via #3326