[rustywind] Allow specifiying --allow-duplicates option

[jaroel]

Howdy,

Allowing duplicate classes is on, and hardcoded here

leptosfmt/formatter/src/formatter/tailwind.rs

Line 10 in 8b4194b

allow_duplicates: true,

.

While this is not really a problem, I wonder if that should be configurable.

I work around this by using rustywind directly as a formatter before handing it over to leptosfmt.
Example zed config:

{
  "languages": {
    "Rust": {
      "formatter": [
        {
          "external": {
            "command": "rustywind",
            "arguments": ["--stdin"]
          }
        },
        {
          "external": {
            "command": "leptosfmt",
            "arguments": ["--rustfmt", "--stdin"]
          }
        }
      ]
    }
  }
}