Improved transactions data sent in network monitor

[alexisbatyk]

Tasks included on this issue:

• [x] Add contracts_data to ServerState in network_metrics_server.rs in fdev.
• [x] Task included: Send all transaction history when the ws connection starts.
• [x] Task included: Store contract data on fn save_record when pushing a new event.

[alexisbatyk]

Task included: Add contracts_data to ServerState in network_metrics_server.rs in fdev.

[alexisbatyk]

Task included: Send all transaction history when the ws connection starts.

[alexisbatyk]

Task included: Store contract data on fn save_record when pushing a new event.