Add VSCode workspace and clang tool configs [AP-3053] #1629

Job	Run time
ASAN	5m 53s
Test Big Endian	9m 26s
Bazel	47s
macOS	14m 10s
Ubuntu 18.04 (Build: Debug, Compilers: gcc-6/g++-6, Shared Library: true)	11m 6s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	9m 33s
UBSAN	6m 1s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: true)	18m 26s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	9m 10s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: false)	19m 51s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: true)	15m 31s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: true)	10m 7s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: false)	15m 28s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: false)	9m 14s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	13m 51s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	13m 59s
	3h 2m 33s

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