[vim/vim] runtime(marko): add Marko syntax highlighting (PR #20863)

Adds syntax highlighting, filetype detection, and syntax screendump tests for Marko templates (*.marko), an HTML-based language that embeds TypeScript expressions and CSS style blocks in both an HTML-like and an indentation-based concise mode.

References:
- https://markojs.com — the Marko language
- https://github.com/marko-js/tree-sitter — grammar this file's constructs were checked against
- https://github.com/marko-js/language-server — language server and the TextMate grammar used as a keyword reference
- https://v5.markojs.com/docs/editor-plugins/ — existing editor support

Implemented & refined iteratively using Fable 5 & Opus 5.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20863

-- Commit Summary --

  * runtime(marko): add Marko syntax highlighting

-- File Changes --

    M runtime/filetype.vim (3)
    A runtime/syntax/marko.vim (307)
    A runtime/syntax/testdir/dumps/marko_00.dump (20)
    A runtime/syntax/testdir/dumps/marko_01.dump (20)
    A runtime/syntax/testdir/dumps/marko_02.dump (20)
    A runtime/syntax/testdir/dumps/marko_concise_00.dump (20)
    A runtime/syntax/testdir/dumps/marko_concise_01.dump (20)
    A runtime/syntax/testdir/dumps/marko_concise_02.dump (20)
    A runtime/syntax/testdir/input/marko.marko (35)
    A runtime/syntax/testdir/input/marko_concise.marko (43)
    M src/testdir/test_filetype.vim (1)

-- Patch Links --

https://github.com/vim/vim/pull/20863.patch
https://github.com/vim/vim/pull/20863.diff

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