[llvm-readobj][ELF] Alter JSON/LLVM output on note sections to allow for multiple notes per section in JSON (#96813)

It turns out that the notes section for corefiles (or really any elf
file with multiple notes) is set up in such a way for LLVM formatted
output that the JSON equivalent only has the last note since the notes
are held in a dictionary with every key being Note. This pr alters the
layout for the notes to a list of dictionaries to sidestep this issue
for JSON output. Prior to this pr a note section in the output looked
like (for LLVM output):

```
Notes [
  NoteSection {
    Name: <?>
    Offset: 0x2148
    Size: 0x1F864
    Note {
      Owner: CORE
      Data size: 0x150
      Type: NT_PRSTATUS (prstatus structure)
      Description data (
        0000: 06000000 00000000 00000000 06000000  |................|
        ...
      )
    }
    Note {
      Owner: CORE
      Data size: 0x88
      Type: NT_PRPSINFO (prpsinfo structure)
      Description data (
        0000: 02440000 00000000 04054040 00000000  |.D........@@....|
	....
```

But is now:

```
NoteSections [
  NoteSection {
    Name: <?>
    Offset: 0x2148
    Size: 0x1F864
    Notes [
      {
        Owner: CORE
        Data size: 0x150
        Type: NT_PRSTATUS (prstatus structure)
        Description data (
          0000: 06000000 00000000 00000000 06000000  |................|
          ...
        )
      }
      {
        Owner: CORE
        Data size: 0x88
        Type: NT_PRPSINFO (prpsinfo structure)
        Description data (
          0000: 02440000 00000000 04054040 00000000  |.D........@@....|
	  ...
```
31 files changed
tree: 41e9afeae88301344343366dc05ece71aee9b03a
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
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