parameters lib convert to c++ (#10267)

platforms/posix/CMakeLists.txt

platforms/posix/src/px4_layer/CMakeLists.txt

platforms/posix/src/px4_layer/px4_posix_impl.cpp

platforms/posix/src/px4_layer/shmem_posix.cpp

platforms/qurt/CMakeLists.txt

platforms/qurt/src/px4_layer/CMakeLists.txt

platforms/qurt/src/px4_layer/px4_qurt_impl.cpp

platforms/qurt/src/px4_layer/shmem_qurt.cpp

src/lib/parameters/CMakeLists.txt

src/lib/parameters/flashparams/CMakeLists.txt

src/lib/parameters/flashparams/flashparams.cpp

src/lib/parameters/flashparams/flashparams.h

src/lib/parameters/param.h

src/lib/parameters/parameters.cpp

src/lib/parameters/parameters_shmem.cpp

src/lib/parameters/tinybson/CMakeLists.txt

src/lib/parameters/tinybson/tinybson.cpp

src/lib/parameters/tinybson/tinybson.h

src/systemcmds/tests/CMakeLists.txt

src/systemcmds/tests/test_bson.cpp