chore(all): use netip.Prefix for ip networks

- remove usage of `net.IPNet`
- remove usage of `netaddr.IPPrefix`

internal/routing/conversion_test.go

@@ -0,0 +1,52 @@
+package routing
+
+import (
+	"net"
+	"net/netip"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_netIPToNetipAddress(t *testing.T) {
+	t.Parallel()
+
+	testCases := map[string]struct {
+		ip           net.IP
+		address      netip.Addr
+		panicMessage string
+	}{
+		"nil ip": {
+			panicMessage: "converting net.IP(nil) to netip.Addr failed",
+		},
+		"IPv4": {
+			ip:      net.IPv4(1, 2, 3, 4),
+			address: netip.AddrFrom4([4]byte{1, 2, 3, 4}),
+		},
+		"IPv6": {
+			ip:      net.IPv6zero,
+			address: netip.AddrFrom16([16]byte{}),
+		},
+		"IPv4 prefixed with 0xffff": {
+			ip:      net.IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 1, 2, 3, 4},
+			address: netip.AddrFrom4([4]byte{1, 2, 3, 4}),
+		},
+	}
+
+	for name, testCase := range testCases {
+		testCase := testCase
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			if testCase.panicMessage != "" {
+				assert.PanicsWithValue(t, testCase.panicMessage, func() {
+					netIPToNetipAddress(testCase.ip)
+				})
+				return
+			}
+
+			address := netIPToNetipAddress(testCase.ip)
+			assert.Equal(t, testCase.address, address)
+		})
+	}
+}