feat(cli): added (multi)-wallet integration

[mickvandijke]

Building on @ermineJose 's PR: #2253

Adds (multi)-wallet support to the CLI. Including wallet encryption.

Adds the following commands to the CLI:

1. wallet create: Creates a new wallet in the wallets folder. The user will be prompted if they want to optionally encrypt the wallet with a password.
2. wallet create --no-password: Same as above, but skips the optional encryption step.
3. wallet create --private-key <PRIVATE_KEY>: Imports a wallet into the wallets folder. The user will be prompted if they want to optionally encrypt the wallet with a password.
4. wallet balance: Prints the wallet token and gas balances in atto's.

If a user owns multiple wallets, they will be presented with a list of wallets to select from for performing a certain action:

Wallets:
+-------+--------------------------------------------+-----------+
| Index | Address                                    | Encrypted |
+-------+--------------------------------------------+-----------+
| 1     | 0x8088440383508eDdaD6132dAfaEEA1d7A476Cb8A | false     |
+-------+--------------------------------------------+-----------+
| 2     | 0x51d1e7B9ABC31f858fDe576A37e6C3a8FB70a693 | false     |
+-------+--------------------------------------------+-----------+
| 3     | 0x5A631e17FfB0F07b00D88E0e42246495Bf21d698 | true      |
+-------+--------------------------------------------+-----------+
Select by index:
1

If the user selects an encrypted wallet, they will have to provide a password to decrypt it:

Wallets:
+-------+--------------------------------------------+-----------+
| Index | Address                                    | Encrypted |
+-------+--------------------------------------------+-----------+
| 1     | 0x8088440383508eDdaD6132dAfaEEA1d7A476Cb8A | false     |
+-------+--------------------------------------------+-----------+
| 2     | 0x51d1e7B9ABC31f858fDe576A37e6C3a8FB70a693 | false     |
+-------+--------------------------------------------+-----------+
| 3     | 0x5A631e17FfB0F07b00D88E0e42246495Bf21d698 | true      |
+-------+--------------------------------------------+-----------+
Select by index:
3
Enter password to decrypt wallet:
Wallet balances: 0x5A631e17FfB0F07b00D88E0e42246495Bf21d698
+---------------+---+
| Token Balance | 0 |
+---------------+---+
| Gas Balance   | 0 |
+---------------+---+