Added an option to generate the context classes final. #908

Job	Run time
cpp-lib-build (macos-11, clang, ON)	1m 32s
cpp-lib-build (macos-11, clang, OFF)	1m 59s
build (macos-11, tool)	1m 55s
cpp-lib-build (macos-11, gcc, ON)	3m 8s
build (macos-11, cpp)	29m 17s
cpp-lib-build (macos-11, gcc, OFF)	3m 23s
build (macos-11, csharp)	12m 31s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 11s
build (macos-11, dart)	10m 0s
cpp-lib-build (ubuntu-20.04, clang, OFF)	3m 25s
build (macos-11, go)	4m 28s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 0s
build (macos-11, java)	2m 5s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	1m 56s
build (macos-11, javascript)	2m 54s
cpp-lib-build (windows-2022, clang, ON)	7m 35s
build (macos-11, typescript)	18m 22s
cpp-lib-build (windows-2022, clang, OFF)	10m 10s
build (macos-11, php)	2m 43s
build (macos-11, python3)	2m 5s
build (ubuntu-20.04, tool)	1m 27s
cpp-lib-build (windows-2022, cl)	10m 50s
build (ubuntu-20.04, cpp)	20m 13s
build (ubuntu-20.04, csharp)	10m 46s
build (ubuntu-20.04, dart)	6m 7s
build (ubuntu-20.04, go)	3m 37s
build (ubuntu-20.04, java)	1m 58s
build (ubuntu-20.04, javascript)	2m 2s
build (ubuntu-20.04, typescript)	17m 9s
build (ubuntu-20.04, php)	2m 5s
build (ubuntu-20.04, python3)	1m 31s
build (windows-2022, tool)	2m 6s
build (windows-2022, cpp)	27m 22s
build (windows-2022, csharp)	17m 3s
build (windows-2022, dart)	9m 10s
build (windows-2022, go)	14m 1s
build (windows-2022, java)	3m 10s
build (windows-2022, javascript)	4m 47s
build (windows-2022, typescript)	37m 10s
build (windows-2022, php)	4m 0s
build (windows-2022, python3)	3m 23s
	5h 24m 36s

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