Set Heartbeat config as true in default

[Abdulsametileri]

Heartbeat: config.HeartbeatConfig{
			// For the first run of the simulation, leave this as false.
			// Then set to true and rerun to see the effect of heartbeat.
			Enabled:  false,
			Query:    `INSERT INTO public.test_heartbeat_table(txt) VALUES ('hb')`,
			Interval: 5 * time.Second,
		},

• remove enabled and set default as true. Remove abstraction.
• set Interval as 100*time.Millisecond. Remove abstraction.
• remove query and get Table (must).
• we will get details of table and choice one column and update a specific time interval.

proposal

Heartbeat: config.HeartbeatConfig{
			table: publication.Tables{
				{
					Name:            "heartbeat_table",
					Schema:          "public",
				},
		},