Share libraries Wallet <-> Boutique

[Tymmmy]

Share libraries between Testnet Wallet backend and Testnet Boutique backend. Identified shareable locations:

• [x] config/logger
• [x] config/knex
• [x] cache - implement redis and in-memory also
• [x] all of the errors
• [x] middleware/errorHandler
• [x] tests/tables
• [x] tests/app
• [x] shared/model
• [x] utils - overlapping methods - use default response methods also for Wallet