Added an event for default stable rule "PTRACE attached to process"

[GLVSKiriti]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind documentation

/kind tests

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area commands

/area pkg

/area events

What this PR does / why we need it:
Added an event for default stable rule "PTRACE attached to process" mentioned here

Which issue(s) this PR fixes:

Fixes #131

Special notes for your reviewer:

[GLVSKiriti]

Below is the screenshot where test is successful and a warning message produces on left terminal on executing event(ptrace attach) code as expected

[GLVSKiriti]

@FedeDP @leogr In this I am creating a dummy process which sleeps for 1hr (And also did the cleanup at end too)
And attaching the current process to the dummy process with ptraceattach syscall which triggers the stable rule

event-generator/events/syscall/ptrace_attached_to_process.go

Lines 27 to 41 in a30ff98

	// Start a dummy process which sleeps for 1hr
	cmd := exec.Command("sleep", "3600")
	if err := cmd.Start(); err != nil {
	h.Log().WithError(err).Error("Failed to start dummy process")
	return err
	}
	pid := cmd.Process.Pid
	h.Log().Infof("Attached to dummy process with PID %d using PTRACE_ATTACH", pid)
	defer syscall.PtraceDetach(pid) // Detach the process at end
	defer cmd.Process.Kill() // Kill the dummy process at end
	// Attach to the target process using PTRACE_ATTACH
	return syscall.PtraceAttach(pid)

[FedeDP]

/approve

[poiana]

LGTM label has been added.

Git tree hash: 71c8613391583b6ccf294008e2d8f76af4adbb4d

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, GLVSKiriti

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