[esp32] reduce default event queue size (#7217)
[esp32] reduce default event queue size (#7217)

The event queue is way too large by default, occupying 6.4 KB.
This PR reduces its size to optimize heap usage on esp32.
nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip