(a)server: support object_path overloads

In order to support safer handling of object paths, directly support
overloads for passing `const sdbusplus::message::object_path&` in
addition to the `char*

(a)server: support object_path overloads

In order to support safer handling of object paths, directly support
overloads for passing `const sdbusplus::message::object_path&` in
addition to the `char* path` functions.

Tested:

New unit tests have been added for server and aserver, for both regular
and property-provided constructors.

Change-Id: I63cb16f4cce75f99ebbbd5ced44ef4a219c7a74a
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>

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