Implement output binary difference tracking

[stephanosio]

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Implement a CI workflow to track the differences in the binary output produced using Zephyr SDK.

The workflow shall track/diff the following:

• binary size (sizes of individual sections in the output ELF files)
• symbol list (added, removed)
• symbol content size (size change)
• symbol content
  • non-code: hex diff
  • code: disassembly diff

The workflow shall run on:

• every push to the default branch
  • diff between the current (head) and the previous commits in the default branch
• every push to pull requests
  • diff between the PR head commit and the default branch head commit