Added an "snet network show_current" command

[PAY2109]

"snet network show_current" command prints the name of the network that the user is currently connected to.

[kiruxaspb]

Command: snet session
Output:

identity.test:
        default_wallet_index: '0'
        identity_type: key
    ipfs:
        default_ipfs_endpoint: /dns/ipfs.singularitynet.io/tcp/80/
    network.goerli:
        default_eth_rpc_endpoint: https://gateway.tenderly.co/public/goerli
        default_multipartyescrow_at: '0x6245F856EFFBDB3ED6a3c64385b27A78B42F65e1'
        default_registry_at: '0x0DD7feC305f2374d7eed35d6d28134936c025A7A'
        default_singularitynettoken_at: '0xdd4292864063d0DA1F294AC65D74d55a44F4766C'
    session:
        identity: test
        network: goerli

The output contains the network field for the current session

[kiruxaspb]

snet session implements the display of the current network used by current session by the user.