[nrf5] Add nRF5 Lighting Example App

[erjiaqing]

Problem

Currently, we have a nRF5 lock app as a example, however, we does not have related ZCLs along with the code, however, we have On-Off cluster and Level Control Cluster, which is quite suitable for an example lighting app.

The code modification should not be large since most of the code should be same, however, the BoltLockManager should be replaced with another class representing a light.

This PR adds nrf5 lighting-app demo.

Summary of Changes

This PR copied lock example and then replaced BoltLockManager to LightingManager.

However, I still have some concerns that what if we keep adding more examples to the examples? Maybe we need to extract common code to seperate directories so we can reuse them in different examples.

fixes #1259

[bukepo]

Can we decouple examples and platforms? So that we don't need to have duplicate platform code.

[erjiaqing]

Can we decouple examples and platforms? So that we don't need to have duplicate platform code.

Aggree, I think the AppTask, LEDWidget, main and Server can be put to seperate directories.

[chip-bot]

Size increase report for "Build Examples [nRF]"

File	Section	File	VM

Full report output

Bloat report for job 'Build Examples [nRF]'

Files found only in the baseline:
    bloat_report.txt

Comparing master_binaries/nrf-build/chip-nrf52840-lock-example.out and example_binaries/nrf-build/chip-nrf52840-lock-example.out:

sections,vmsize,filesize

[chip-bot]

Size increase report for "Build Examples [ESP32]"

File	Section	File	VM
chip-wifi-echo.elf	.flash.rodata	8	8
chip-wifi-echo.elf	.dram0.bss	0	-8
chip-wifi-echo.elf	.dram0.data	-8	-8
chip-wifi-echo.elf	.flash.text	-44	-44

Full report output

Bloat report for job 'Build Examples [ESP32]'

Files found only in the baseline:
    bloat_report.txt

Comparing master_binaries/esp32-build/chip-wifi-echo.elf and example_binaries/esp32-build/chip-wifi-echo.elf:

sections,vmsize,filesize
.flash.rodata,8,8
[Unmapped],0,-4
.dram0.bss,-8,0
.dram0.data,-8,-8
.flash.text,-44,-44

[chip-bot]

Size increase report for "Build Examples [main-build]"

File	Section	File	VM

Full report output

Bloat report for job 'Build Examples [main-build]'

Files found only in the baseline:
    bloat_report.txt

Comparing master_binaries/main-build/chip-standalone-demo.out and example_binaries/main-build/chip-standalone-demo.out:

sections,vmsize,filesize

[CLAassistant]

All committers have signed the CLA.

[erjiaqing]

This PR is replaced by #1436 due to the broken fork caused by making chip public, close now.