Deprecate legacy API [AP-643] #1401

Job	Run time
Bazel	6m 35s
Ubuntu 18.04 (Build: Debug, Compilers: gcc-6/g++-6, Shared Library: true)	15m 59s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	13m 54s
Test Big Endian	20m 30s
macOS	37m 0s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	13m 49s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: true)	26m 45s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: false)	26m 53s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: true)	21m 32s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: false)	22m 2s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: true)	9m 12s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	20m 42s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	20m 10s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: false)	8m 54s
	4h 23m 57s

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