[io-layer] Extract Process runtime support (#3859)

[io-layer] Extract Process runtime support (#3859)

* [process] Separate code for unix and win32

* [process] Extract OpenProcess

* [process] Extract GetCurrentProcess

* [process] Extract GetModuleFileNameEx

* [process] Extract GetModuleBaseName

* [process] Extract EnumProcessModules

* [process] Extract GetModuleInformation

* [process] Extract CloseProcess

* [process] Extract ShellExecuteEx

* [process] Extract CreateProcessWithLogonW

* [process] Extract GetProcessId

* [process] Extract GetExitCodeProcess

* [process] Extract GetProcessWorkingSetSize and SetProcessWorkingSetSize

* [process] Extract GetPriorityClass and SetPriorityClass

* [process] Extract TerminateProcess

* [process] Extract GetProcessTimes

* [process] Extract CreateProcess

* [process] Extract wapi_process_set_cli_launcher

* [process] Extract wapi_process_get_path

* [process] Remove unused #define in processes.h

* [process] Extract _wapi_process_duplicate

* [process] Extract MonoW32HandleOps

* [process] Move the process related icalls to w32process

* [Process] Move platform specific code to dedicated files

* [process] Cleanup function names

* [io-layer] Remove dead code

* [process] Factor common unix and win32 code

* [process] Fix windows compilation