modules: openthread: Add Kconfig check for precompiled libraries

Add configuration validation when using precompiled OpenThread
libraries. This helps users identify Kconfig options that differ
from the library's built-in configuration and would have no
effect.

- Create openthread_kconfig_check.cmake with utilities for
  tracking Kconfig to OT option mappings
- Move the kconfig_to_ot_option macro for boolean options to
  a separate script file.
- Add kconfig_to_ot_string_option macro for string options
- Register all OpenThread Kconfig options including FTD/MTD and
  string options like POWER_SUPPLY, THREAD_VERSION, etc.
- Add kconfig_to_ot_string_option macro for string options
- Add openthread_check_kconfig_for_precompiled_libs function
  that:
  - Reads openthread_lib_configuration.txt from the selected
    library
  - Compares current Kconfig values with library OT_* values
  - Displays a warning listing differing options when
    mismatches found

When CONFIG_OPENTHREAD_SOURCES is not set, users will now see a
warning if their configuration differs from the precompiled library,
guiding them to either adjust their config or build from sources.

Signed-off-by: Arkadiusz Balys <[email protected]>

Author: ArekBalysNordic

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -169,7 +169,7 @@ nRF IEEE 802.15.4 radio driver
 Thread
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-|no_changes_yet_note|
+* Added a warning when using precompiled OpenThread libraries with modified Kconfig options related to the OpenThread stack.
 
 Wi-Fi®
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