Add VSCode workspace and clang tool configs [AP-3053] #1631

Job	Run time
Test Big Endian	9m 27s
Bazel	41s
ASAN	40s
macOS	14m 33s
UBSAN	55s
Ubuntu 18.04 (Build: Debug, Compilers: gcc-6/g++-6, Shared Library: true)	49s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: true)	20m 23s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	53s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: false)	19m 36s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	53s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: true)	9m 30s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: true)	52s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: false)	9m 41s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: false)	50s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	52s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	52s
	1h 31m 27s

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