Implemented Callback sample #191

Job	Run time
Code formatting	17s
Exercise Python examples on ubuntu-latest	5m 59s
Check Ruby Samples ubuntu-latest	1m 45s
Exercise Python examples on macos-latest	8m 53s
Check Ruby Samples macos-latest	1m 45s
Build Windows fetch	3m 34s
Build ubuntu-20.04 gcc os	1m 50s
Build Windows vcpkg	10m 15s
Build ubuntu-20.04 gcc fetch	3m 6s
Build ubuntu-20.04 gcc vcpkg	6m 12s
Build ubuntu-20.04 clang os	1m 16s
Build ubuntu-20.04 clang fetch	4m 4s
Build ubuntu-20.04 clang vcpkg	7m 36s
Build macos-latest gcc os	2m 29s
Build macos-latest gcc fetch	2m 44s
Build macos-latest gcc vcpkg	2m 15s
Build macos-latest clang os	2m 47s
Build macos-latest clang fetch	2m 31s
Build macos-latest clang vcpkg	2m 8s
	1h 11m 26s

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