[Cards] Card management in Test Wallet - Backend

[sanducb]

Context

We need to implement card management in test wallet backend. Card activation will be handled by GateHub and cards will be locked by default.

Todos

Test wallet backend needs to be able to handle:

• [x] https://github.com/interledger/testnet/issues/1626
• [x] https://github.com/interledger/testnet/issues/1628
• [x] https://github.com/interledger/testnet/issues/1627
• [x] https://github.com/interledger/testnet/issues/1629
• [x] https://github.com/interledger/testnet/issues/1630
• [x] https://github.com/interledger/testnet/issues/1660
• [ ] https://github.com/interledger/testnet/issues/1667
• [ ] https://github.com/interledger/testnet/issues/1670
• [ ] https://github.com/interledger/testnet/issues/1712
• [ ] #1673