src: add GetBuildId helper function

[santigimeno]

To allow us to read the Build-Id from ELF headers in a specific binary.

Summary by CodeRabbit

• Chores

  • Updated Linux build configuration to include ELF utilities and link required libraries, with no impact on other platforms.
  • Refined linker behavior on Linux and OpenHarmony to improve compatibility.

• Tests

  • Added a Linux-only integration test that validates build ID retrieval via a native addon.
  • Introduced a supporting test addon to exercise the new Linux functionality.