[shell]:Start CHIP event-loop by default during initialization. (#4185)
[shell]:Start CHIP event-loop by default during initialization. (#4185)

* Start CHIP event-loop by default during initialization.

* Add CHIP memory init during initialization
nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip