Improve Linux shutdown, memory handling, and messaging integration

[kr-t]

Description

• Fixed shutdown behavior on Linux systems to ensure proper termination
• Placed WAMR heap in external RAM when enabled for better memory management
• Added validity checks before accessing module parameters to prevent crashes
• Included ocre_common.h when messaging is defined to support conditional compilation

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Multiple containers both on Linux and U585 from ocre-sdk

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[kr-t]

From https://github.com/project-ocre/ocre-runtime/actions/runs/17377009133/job/49325509071?pr=78#step:8:658 :

Memory region         Used Size  Region Size  %age Used
           FLASH:      443956 B         2 MB     21.17%
             RAM:      173736 B       768 KB     22.09%
           PSRAM:          8 MB         8 MB    100.00%
          EXTMEM:          0 GB        64 MB      0.00%
        IDT_LIST:          0 GB        32 KB      0.00%

8 Megs!