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/tests/CMakeLists.txt

@@ -0,0 +1,21 @@
+add_executable(deviceAttachmentSpecParams_tests
+	deviceAttachmentSpecParams_tests.cpp
+)
+
+target_include_directories(deviceAttachmentSpecParams_tests PRIVATE
+	${CMAKE_SOURCE_DIR}/include
+	${CMAKE_BINARY_DIR}/include
+	${CMAKE_SOURCE_DIR}/libspinscale/tests
+)
+
+target_link_libraries(deviceAttachmentSpecParams_tests
+	gtest_main
+	spinscale_test_support
+	${Boost_LIBRARIES}
+)
+
+add_dependencies(deviceAttachmentSpecParams_tests gtest_main)
+
+add_test(
+	NAME deviceAttachmentSpecParams_tests
+	COMMAND deviceAttachmentSpecParams_tests)