exec: Windows Exec support and Safe Mode

[tarunKoyalwar]

Description

• Adds support for command execution in Windows
• API CHANGE

Adds:
 RunPS(cmd ...string) // Run Command in Windows
 RunSafe(cmd ...string) // Run Command without using os shell with limited features
Update:
 Run(cmd ...string)  // Now supports Pipe(|) , redirection (> << & etc) along with other shell features

• Adds Appropriate Unit Tests

[Mzack9999]

lgtm!