Implement consistent file extensions for Typescript imports #959

Job	Run time
cpp-lib-build (macos-11, clang, ON)	4m 31s
cpp-lib-build (macos-11, clang, OFF)	7m 29s
build (macos-11, tool)	1m 51s
cpp-lib-build (macos-11, gcc, ON)	4m 35s
build (macos-11, cpp)	29m 17s
cpp-lib-build (macos-11, gcc, OFF)	7m 29s
build (macos-11, csharp)	10m 9s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 38s
build (macos-11, dart)	6m 31s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 13s
build (macos-11, go)	4m 54s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 21s
build (macos-11, java)	2m 20s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 8s
build (macos-11, javascript)	3m 2s
cpp-lib-build (windows-2022, clang, ON)	5m 2s
cpp-lib-build (windows-2022, clang, OFF)	6m 9s
build (macos-11, typescript)	18m 22s
cpp-lib-build (windows-2022, cl)	4m 6s
build (macos-11, php)	13m 35s
build (macos-11, python3)	2m 3s
build (ubuntu-20.04, tool)	1m 14s
build (ubuntu-20.04, cpp)	17m 24s
build (ubuntu-20.04, csharp)	5m 51s
build (ubuntu-20.04, dart)	3m 53s
build (ubuntu-20.04, go)	2m 36s
build (ubuntu-20.04, java)	1m 17s
build (ubuntu-20.04, javascript)	1m 55s
build (ubuntu-20.04, typescript)	10m 27s
build (ubuntu-20.04, php)	1m 47s
build (ubuntu-20.04, python3)	1m 12s
build (windows-2022, tool)	1m 53s
build (windows-2022, cpp)	22m 34s
build (windows-2022, csharp)	6m 39s
build (windows-2022, dart)	4m 16s
build (windows-2022, go)	4m 48s
build (windows-2022, java)	2m 29s
build (windows-2022, javascript)	2m 22s
build (windows-2022, typescript)	23m 18s
build (windows-2022, php)	2m 9s
build (windows-2022, python3)	2m 15s
	4h 25m 4s

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