[OSCBS-41] Update to Zephyr v3.2.0 (#382)

Updating to integrate with Zephyr v3.2.0 required:

- Update `west.yml` to import Zephyr v3.2.0 manifest
- Prefix include pathname of ztest.h with `zephyr/`
- Prefix every Zephyr header included pathname with `zephyr/`
- Change all Zephyr tests/samples to use `find_package`
- For unit_testing, use a distinct prj.conf which only references
  Kconfigs defined in the Zephyr repo. (Zephyr constraint.)
- Move ztest headers into a zephyr-prefixed pathname

Co-authored-by: Gregory Shue <gregory.shue@legrand.com>

zephyr/tests/bacnet/basic/binding/address/CMakeLists.txt

@@ -41,10 +41,11 @@ if(BOARD STREQUAL unit_testing)
 
   add_definitions(-DBACNET_ADDRESS_CACHE_FILE=1)
 
-  include($ENV{ZEPHYR_BASE}/subsys/testsuite/unittest.cmake)
+  set(CONF_FILE "${CONF_FILE};prj.unit_testing.conf")
+  find_package(Zephyr COMPONENTS unittest REQUIRED HINTS $ENV{ZEPHYR_BASE})
   project(${BACNET_NAME})
 else()
-  include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+  find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
   project(${BACNET_NAME})
 
   target_include_directories(app PRIVATE ${BACNET_INCLUDE})

zephyr/tests/bacnet/basic/binding/address/prj.unit_testing.conf

@@ -0,0 +1,3 @@
+CONFIG_ZTEST=y
+#CONFIG_BACNETSTACK=y
+#CONFIG_BACNET_ADDRESS_CACHE_FILE=y