[vim/vim] Syntax Highlighting for JSON-LD (PR #20954)

Adds syntax highlighting for W3C's JSON-LD by making use of JSON's highlighting and adding the JSON-LD keywords to it. For example, in the following `.jsonld` file

```
{
  "@context": {
    "name": "https://schema.org/name"
  },
  "name": "Alice"
}
```

`@context` will be highlighted using the `SpecialChar` group. I chose this highlighting group because it is consistent with other languages, for example this is how C conversion specifiers such as `%d` are highlighted in the string `"Number: %d"`.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20954

-- Commit Summary --

  * filetype: JSON-LD files have no dedicated syntax support

-- File Changes --

    M runtime/autoload/dist/ft.vim (4)
    A runtime/ftplugin/jsonld.vim (10)
    A runtime/indent/jsonld.vim (6)
    M runtime/makemenu.vim (3)
    M runtime/synmenu.vim (31)
    A runtime/syntax/jsonld.vim (31)
    A runtime/syntax/testdir/dumps/jsonld_00.dump (20)
    A runtime/syntax/testdir/dumps/jsonld_01.dump (20)
    A runtime/syntax/testdir/dumps/jsonld_02.dump (20)
    A runtime/syntax/testdir/input/jsonld.jsonld (41)
    M src/testdir/test_filetype.vim (1)

-- Patch Links --

https://github.com/vim/vim/pull/20954.patch
https://github.com/vim/vim/pull/20954.diff

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