Add support for 99.73 confidence interval [AP-3002] (#1449) #1578

Job	Run time
ASAN	6m 42s
Bazel	5m 53s
Test Big Endian	9m 24s
macOS	14m 15s
Ubuntu 18.04 (Build: Debug, Compilers: gcc-6/g++-6, Shared Library: true)	10m 0s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	9m 13s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	9m 26s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: true)	14m 47s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: false)	14m 35s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	14m 10s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	13m 55s
UBSAN	6m 59s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: true)	19m 5s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: false)	21m 5s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: true)	9m 22s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: false)	9m 52s
	3h 8m 43s

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