feat(dbus): Add extend_interface function for dynamic interface naming

This function constructs a fully qualified interface name by appending
segments to a predefined base name. It simplifies and standardizes the
process of generating extended interface names in the middleware.

src/revpi_middleware/dbus_middleware1/__init__.py

@@ -6,3 +6,23 @@ from ..__about__ import __author__, __copyright__, __license__, __version__
 
 REVPI_DBUS_NAME = "com.revolutionpi.middleware1"
 REVPI_DBUS_BASE_PATH = "/com/revolutionpi/middleware1"
+
+
+def extend_interface(*args) -> str:
+    """
+    Extends an interface name by appending additional segments to a pre-defined base name.
+
+    This function takes multiple arguments, concatenates them with a predefined base
+    interface name, and returns the resulting string, effectively constructing an
+    extended interface name.
+
+    Args:
+        *args: str
+            Components to be appended to the base interface name.
+
+    Returns:
+        str
+            Fully constructed interface name by joining the base interface name with
+            the provided segments.
+    """
+    return ".".join([REVPI_DBUS_NAME, *args])