[Tisya-Gupta]

This PR adds support for building ThreadX with module manager in CMake. Right now CMake only supports standard and SMP builds, so anyone using FetchContent or add_subdirectory cannot build the module manager kernel without patching the build files.

I added a THREADX_MODULE_MANAGER option that pulls the port sources from ports_module and compiles the common module manager files, defines TXM_MODULE_MANAGER, and exports the module headers like txm_module.h. It also adds a small check target to make sure consumer code compiles, updates the Cortex-M CI workflow, and adds build steps to the README.

Closes #770

[fdesbiens]

Thank you for this, @Tisya-Gupta. CI is green across every workflow, and I also built the module-manager kernel and the consumer check locally for Cortex-M0+, M3, M4, M7, M23, M33 and R52 with GCC 14.3; all of them build.

I pushed one small commit to your branch: the new common_modules/module_manager/CMakeLists.txt carried a 2024 Microsoft Corporation copyright line, but since the file is new in this change it carries only the Eclipse ThreadX contributors line.

A possible follow-up, not needed for this PR: CI covers the GNU M0+, M3, M4 and M7 module ports, and M23, M33 and R52 also build with THREADX_MODULE_MANAGER=ON, so they could be added to the workflow later.

[Tisya-Gupta]

Thank you for the review and for fixing the copyright issue!. I'll raise a separate PR later to add the remaining architectures to the CI workflow....