[I] Add Automaton.toMermaid() for emitting mermaid state charts [lucene]

["dweiss (via GitHub)" <gi...@apache.org>]

dweiss opened a new issue, #14351:
URL: https://github.com/apache/lucene/issues/14351

   ### Description
   
   We currently have .toDot() but github supports inline mermaid [2] graphs [1], like this:
   ```mermaid
   graph LR;
       A-->B;
       A-->C;
       B-->D;
       C-->D;
   ```
   and it'd be a nice to have for copy-pasting into issues that touch automata in Lucene.
   
   [1] https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-diagrams#creating-mermaid-diagrams
   [2] https://mermaid.js.org/syntax/stateDiagram.html


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