Improve debugging and use LookPath

[tarunKoyalwar]

Proposed Changes

• Use LookPath for locating and initializing binaries ( it is not intrusive way to validate existance of a command )
• earlier we used to execute command directly with 1 sec timeout for validating engine which could be the reason behind the flakiness observed in powershell engines and windows env in general
• Added hooks and extra debug mode to dump combined stdout + stderr
• upstream PR Code protocol bug fixes and improvements nuclei#5767

Note

Apart from slight intrusive methodology , Nuclei in windows environment was sometimes returning powershell.exe engine not found randomly due to exec behaviour with 1 sec timeout (go in windows is know to be very slow, and this box in particular had less compute) , by switching to LookPath this issue was resolved and template loading time is stable and faster in windows especially with low spec