Add coredump server to -multi devices

[etiaro]

Description

Adds optional builin coredump server in -multi devices in order to allow including in -multi devices to save memory on imxrt and stm32l4, similar to posixsrv and dummyfs.

Motivation and Context

Types of changes

• 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 change)
• Chore (refactoring, style fixes, git/CI config, submodule management, no code logic changes)

How Has This Been Tested?

• Already covered by automatic testing.
• New test added: (add PR link here).
• Tested by hand on: armv7m7-imxrt117x-evk

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing linter checks and tests passed.
• My changes generate no new compilation warnings for any of the targets.

Special treatment

• This PR needs additional PRs to work (list the PRs, preferably in merge-order).
• libcoredumpsrv: introduction of coredumping phoenix-rtos-corelibs#57
• I will merge this PR by myself when appropriate.

[gemini-code-assist]

Summary of Changes

Hello @etiaro, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a built-in coredump server to the imxrt-multi and stm32l4-multi projects. This enhancement allows for the capture and saving of coredumps, which are crucial for post-mortem debugging of crashes in embedded systems. The changes integrate the coredump server as a new thread within the main application, providing a mechanism to configure and enable/disable this functionality during compilation.

Highlights

• Coredump Server Integration: A new coredumpsrv.c file is added for both imxrt-multi and stm32l4-multi targets, implementing a dedicated thread (coredumpsrv_thr) that initializes and runs the libcoredumpsrv server.
• Build System Updates: Makefiles for both imxrt-multi and stm32l4-multi are modified to include the new coredumpsrv.c source file and link against the libcoredumpsrv library, ensuring the coredump server is part of the build.
• Configurable Coredump Feature: Configuration headers (config.h) and Makefiles are updated to introduce BUILTIN_COREDUMPSRV and COREDUMP_DISABLE macros, allowing the coredump server to be conditionally compiled and enabled/disabled.
• Application Startup Integration: The main functions in imxrt-multi.c and stm32l4-multi.c are updated to conditionally start the coredumpsrv_start() function, ensuring the coredump server thread is launched when the application begins.

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[gemini-code-assist]

Code Review

This pull request introduces a coredump server for both imxrt-multi and stm32l4-multi. The changes are generally good, but there's a significant amount of code duplication with the new coredumpsrv.c files. My review includes suggestions to refactor this into a shared component, make the file-scope variables static, allow for configuration of coredump options, and simplify some preprocessor logic for better consistency and maintainability.