Implement typed D-Bus properties (Bug#43252)

Implement typed D-Bus properties (Bug#43252)

* doc/misc/dbus.texi (Properties and Annotations)
(Receiving Method Call): Document optional type symbol in
`dbus-set-property' and `dbus-register-property'.

* lisp/net/dbus.el (dbus-error-unknown-interface)
(dbus-error-unknown-method, dbus-error-unknown-object)
(dbus-error-unknown-property): New defconsts.
(dbus-peer-handler): Improve error handling.
(dbus-introspect-get-signature): Handle also properties.
(dbus-set-property, dbus-register-property): Allow optional TYPE
symbol for VALUE.  (Bug#43252)
(dbus-property-handler): Implement property types.  Improve error
handling.

* src/dbusbind.c (dbus-message-internal, dbus-registered-objects-table):
Fix docstring.

* test/lisp/net/dbus-tests.el (dbus-test05-register-property):
Extend test.
(dbus-test05-register-property-several-paths): New test.