[adampoit]

Register stylua as a built-in formatter for .lua files when the binary is available, and document it in the formatter support table.

Issue for this PR

Closes #14817

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

• Adds stylua to built-in formatters with .lua extension support
• Enables it only when stylua is available on PATH
• Documents stylua in the formatter docs table

How did you verify your code works?

• Installed stylua and confirmed .lua files are detected/format-enabled via the built-in formatter list
• Verified behavior remains unchanged when stylua is not installed

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[rekram1-node]

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