[llvm] [llvm-objdump] Error with relevant message when adding invalid notes (PR #90458)

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serge-sans-paille wrote:

Thanks for the early comments. My use case was very pragamatic: trying to add a note, forgetting about the required padding and then wondering how to improve the situation. I like the idea of the very explicit `--add-note-section` that would quite naturally imply a check. @nickclifton do you think we could see that in binutils' `objcopy` too? That way we would avoid having (too much) diverging CLI.

https://github.com/llvm/llvm-project/pull/90458