[IOTE-6][IOTE-326] Add weeks behavior flag to MSG_GNSS_TIME_OFFSET #1484

Job	Run time
ASAN	9m 20s
Bazel	8m 43s
Test Big Endian	9m 28s
macOS	38m 29s
UBSAN	9m 45s
Ubuntu 18.04 (Build: Debug, Compilers: gcc-6/g++-6, Shared Library: true)	15m 54s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: true)	27m 1s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	14m 28s
Windows 2019 (Generator: MinGW Makefiles, Shared Library: false)	27m 55s
Ubuntu 18.04 (Build: Debug, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	14m 46s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: true)	9m 38s
Windows 2019 (Generator: Visual Studio 16 2019, Shared Library: false)	9m 48s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: true)	22m 2s
Ubuntu 18.04 (Build: Release, Compilers: gcc-6/g++-6, Shared Library: false)	22m 9s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: true)	21m 20s
Ubuntu 18.04 (Build: Release, Compilers: clang-6.0/clang++-6.0, Shared Library: false)	20m 30s
	4h 41m 16s

Provide feedback