Support more code fence formatter plugins through config

[nzoschke]

Fixes #151

Note this was coded with Claude

in @src/wasm_plugin.rs make tag_to_extension also support using the config to map extensions to plugins. An example config to support a new cue tag and plugin is:

  {
    "markdown": {
      "tags": {
        "cue": "cue",
        "cuelang": "cue"
      }
    },
    "plugins": [
      "https://plugins.dprint.dev/typescript-0.95.11.wasm",
      "https://plugins.dprint.dev/json-0.20.0.wasm",
      "https://plugins.dprint.dev/markdown-0.19.0.wasm",
      "https://plugins.dprint.dev/cue-0.1.0.wasm"
    ]
  }

[nzoschke]

I tested this is working with this config:

• local build of the markdown plugin as markdown-0.20.1.wasm
• markdown plugin config with tags section
• exec plugin config with with cue section

{
  "typescript": {},
  "json": {},
  "markdown": {
    "tags": {
      "cue": "cue",
      "cuelang": "cue"
    }
  },
  "toml": {},
  "malva": {},
  "markup": {},
  "yaml": {},
  "excludes": ["**/node_modules", "**/*-lock.json"],
  "exec": {
    "commands": [
      {
        "command": "cue fmt -",
        "exts": ["cue"]
      }
    ]
  },
  "plugins": [
    "https://plugins.dprint.dev/typescript-0.95.11.wasm",
    "https://plugins.dprint.dev/json-0.21.0.wasm",
    "./markdown-0.20.1.wasm",
    "https://plugins.dprint.dev/toml-0.7.0.wasm",
    "https://plugins.dprint.dev/g-plane/malva-v0.14.3.wasm",
    "https://plugins.dprint.dev/g-plane/markup_fmt-v0.24.0.wasm",
    "https://plugins.dprint.dev/g-plane/pretty_yaml-v0.5.1.wasm",
    "https://plugins.dprint.dev/exec-0.5.0.json@8d9972eee71fa1590e04873540421f3eda7674d0f1aae3d7c788615e7b7413d0"
  ]
}