allow custom args

[tarunKoyalwar]

Proposed Changes

• goflags now allows passing custom args if given instead of os.Args[1:]

• this was implemented to debug nuclei but vscode debugger can't handle codebase size but this will help in other projects

• this is expected to be used in debugging or intergration tests
  ex:

package main

import (
	"testing"

	"github.com/projectdiscovery/goflags"
)

func TestNuclei(t *testing.T) {
	command := `-u https://scanme.sh -stats -pt dns`
	run(goflags.GetArgsFromString(command)...)
}

projectdiscovery/nuclei@fb3365c