TUN-8729: implement network collection for diagnostic procedure

## Summary
This PR adds implementation for windows & unix that collect the tracert.exe & traceroute output in the form of hops.

Closes TUN-8729

diagnostic/network/collector_utils.go

@@ -0,0 +1,65 @@
+package diagnostic
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"os/exec"
+)
+
+type DecodeLineFunc func(text string) (*Hop, error)
+
+func decodeNetworkOutputToFile(command *exec.Cmd, fn DecodeLineFunc) ([]*Hop, string, error) {
+	stdout, err := command.StdoutPipe()
+	if err != nil {
+		return nil, "", fmt.Errorf("error piping traceroute's output: %w", err)
+	}
+
+	if err := command.Start(); err != nil {
+		return nil, "", fmt.Errorf("error starting traceroute: %w", err)
+	}
+
+	// Tee the output to a string to have the raw information
+	// in case the decode call fails
+	// This error is handled only after the Wait call below returns
+	// otherwise the process can become a zombie
+	buf := bytes.NewBuffer([]byte{})
+	tee := io.TeeReader(stdout, buf)
+	hops, err := Decode(tee, fn)
+
+	if werr := command.Wait(); werr != nil {
+		return nil, "", fmt.Errorf("error finishing traceroute: %w", werr)
+	}
+
+	if err != nil {
+		// consume all output to have available in buf
+		io.ReadAll(tee)
+		// This is already a TracerouteError no need to wrap it
+		return nil, buf.String(), err
+	}
+
+	return hops, "", nil
+}
+
+func Decode(reader io.Reader, fn DecodeLineFunc) ([]*Hop, error) {
+	scanner := bufio.NewScanner(reader)
+	scanner.Split(bufio.ScanLines)
+
+	var hops []*Hop
+	for scanner.Scan() {
+		text := scanner.Text()
+		hop, err := fn(text)
+		if err != nil {
+			return nil, fmt.Errorf("error decoding output line: %w", err)
+		}
+
+		hops = append(hops, hop)
+	}
+
+	if scanner.Err() != nil {
+		return nil, fmt.Errorf("scanner reported an error: %w", scanner.Err())
+	}
+
+	return hops, nil
+}