Add shared DeviceAttachmentSpec param parsing helpers.

Centralize DAP param lookup, parsing, and validation primitives so stimBuff
and threshold modules can share one implementation instead of duplicating
parse logic per plugin.

Co-authored-by: Cursor <cursoragent@cursor.com>

commonLibs/attachmentSupport/CMakeLists.txt

@@ -44,3 +44,7 @@ add_custom_command(TARGET attachmentSupport POST_BUILD
 install(TARGETS attachmentSupport
 	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} NAMELINK_SKIP
 )
+
+if(ENABLE_TESTS)
+	add_subdirectory(tests)
+endif()