feat(cli): Add D-Bus helper functions for CLI commands.

This introduces `simple_call`, a utility function to interact with D-Bus
interfaces within the RevPi system. It facilitates method invocation on
specific interfaces and paths, improving modularity and code reuse in
middleware operations.

src/revpi_middleware/cli_commands/cli_picontrol.py

@@ -0,0 +1,46 @@
+# SPDX-FileCopyrightText: 2025 KUNBUS GmbH
+# SPDX-License-Identifier: GPL-2.0-or-later
+"""Command-Line for the picontrol object of CLI."""
+from argparse import ArgumentParser
+from logging import getLogger
+
+from .dbus_helper import simple_call
+from .. import proginit as pi
+from ..dbus_middleware1 import extend_interface
+
+log = getLogger(__name__)
+
+
+def add_subparsers(parent_parser: ArgumentParser):
+    methods = parent_parser.add_subparsers(
+        dest="methods",
+        title="methods",
+        help="Available RevPi PiControl methods",
+    )
+    methods.add_parser(
+        "reset",
+        help="Reset the piControl driver",
+    )
+
+
+def method_reset():
+    log.debug("D-Bus call of method ResetDriver")
+    simple_call("ResetDriver", interface=extend_interface("picontrol"))
+    log.info("ResetDriver called via D-Bus")
+
+
+def main() -> int:
+    method = pi.pargs.methods
+    try:
+
+        if method == "reset":
+            method_reset()
+
+        else:
+            raise Exception(f"Unknown method: {method}")
+
+    except Exception as e:
+        log.error(f"Error: {e}")
+        return 1
+
+    return 0