feat(protonvpn): feature filters (#2182)

- `SECURE_CORE_ONLY`
- `TOR_ONLY`
- `P2P_ONLY`

internal/models/server_test.go

@@ -60,6 +60,9 @@ func Test_Server_Equal(t *testing.T) {
 				WgPubKey:    "wgpubkey",
 				Free:        true,
 				Stream:      true,
+				SecureCore:  true,
+				Tor:         true,
+				P2P:         false,
 				PortForward: true,
 				IPs:         []netip.Addr{netip.AddrFrom4([4]byte{1, 2, 3, 4})},
 				Keep:        true,
@@ -82,6 +85,9 @@ func Test_Server_Equal(t *testing.T) {
 				WgPubKey:    "wgpubkey",
 				Free:        true,
 				Stream:      true,
+				SecureCore:  true,
+				Tor:         true,
+				P2P:         false,
 				PortForward: true,
 				IPs:         []netip.Addr{netip.AddrFrom4([4]byte{1, 2, 3, 4})},
 				Keep:        true,