[WIP] Added tests entrypoints for processes

..._tools/processes_tests/exception_unwinding/CMakeLists.txt

...ls/processes_tests/exception_unwinding/debugging_notes.md

...sses_tests/exception_unwinding/how_to_debug_with_clang.md

miosix/_tools/processes_tests/exception_unwinding/main.cpp

miosix/_tools/processes_tests/extern_const/CMakeLists.txt

miosix/_tools/processes_tests/extern_const/main.cpp

miosix/_tools/processes_tests/processes_patch_recap.md