Add Windows environment block parsing and expose process environment variables

[forensicxlab]

This PR introduce environment variables listing for the Win32Kernel implementing the memflow Process trait. It is linked to these memflow PR and memflow-rawmem PR

• Introduces Win32EnvListInfo, which locates the environment block via PEB->ProcessParameters->Environment (for both native and WOW64) and uses _RTL_USER_PROCESS_PARAMETERS::EnvironmentSize to bound parsing.

I hope this is the right way to contribute to this project as I'm still learning about the whole framework :)

Cheers.
k1nd0ne.