Updating TV example app to add support for on-off level control commands

[lazarkov]

Problem

TV example app does not support on and off commands
TV example app does not support level control commands

Summary of Changes

• Added attribute change callback so that developper can detect on-off attribute change and implement logic for TV
• Added LevelControl.cpp file so that developper can use it and change current level-control.h file. We do not need all the logic from the current level-control cluster. Handeling step command is enough.

Note

Everything which is not supported by the CHIP framework currently is noted with TODO comment.

Test

• Tested locally using chip-tool client and newly created tv-server
• Used the ./scripts/tools/zap_regen_all.py and ./gn_build.sh to verify the building is successful

[todo]

Insert your code here to send power toggle command

connectedhomeip/examples/tv-app/linux/include/cluster-change-attribute.cpp

Lines 36 to 46 in 549a3dd

	// TODO: Insert your code here to send power toggle command
	break;
	case MuteToggle:
	// TODO: Insert your code here to send mute toggle command
	break;
	default:
	break;
	}
	}

---

This comment was generated by todo based on a TODO comment in 549a3dd in #6417. cc @lazarkov.

[todo]

Insert your code here to send mute toggle command

connectedhomeip/examples/tv-app/linux/include/cluster-change-attribute.cpp

Lines 39 to 49 in 549a3dd

	// TODO: Insert your code here to send mute toggle command
	break;
	default:
	break;
	}
	}
	void emberAfPostAttributeChangeCallback(EndpointId endpoint, ClusterId clusterId, AttributeId attributeId, uint8_t mask,
	uint16_t manufacturerCode, uint8_t type, uint8_t size, uint8_t * value)
	{

---

This comment was generated by todo based on a TODO comment in 549a3dd in #6417. cc @lazarkov.

[todo]

Insert your code here to send volume up command

connectedhomeip/examples/tv-app/linux/include/level-control/LevelControl.cpp

Lines 94 to 104 in 549a3dd

	// TODO: Insert your code here to send volume up command
	}
	else
	{
	ChipLogProgress(Zcl, "Volume DOWN");
	// TODO: Insert your code here to send volume down command
	}
	}
	status = emberAfWriteServerAttribute(endpoint, ZCL_LEVEL_CONTROL_CLUSTER_ID, ZCL_CURRENT_LEVEL_ATTRIBUTE_ID,
	(uint8_t *) &currentLevel, ZCL_INT8U_ATTRIBUTE_TYPE);
	state->storedLevel = currentLevel;

---

This comment was generated by todo based on a TODO comment in 549a3dd in #6417. cc @lazarkov.

[todo]

Insert your code here to send volume down command

connectedhomeip/examples/tv-app/linux/include/level-control/LevelControl.cpp

Lines 99 to 109 in 549a3dd

	// TODO: Insert your code here to send volume down command
	}
	}
	status = emberAfWriteServerAttribute(endpoint, ZCL_LEVEL_CONTROL_CLUSTER_ID, ZCL_CURRENT_LEVEL_ATTRIBUTE_ID,
	(uint8_t *) &currentLevel, ZCL_INT8U_ATTRIBUTE_TYPE);
	state->storedLevel = currentLevel;
	ChipLogProgress(Zcl, "Setting volume to new level %d", state->storedLevel);
	}
	send_default_response:
	if (emberAfCurrentCommand()->apsFrame->clusterId == ZCL_LEVEL_CONTROL_CLUSTER_ID)

---

This comment was generated by todo based on a TODO comment in 549a3dd in #6417. cc @lazarkov.

[woody-apple]

@saurabhst @msandstedt ?