feat: Add mdformat plugin

qlty-plugins/plugins/linters/mdformat/README.md

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+# mdformat
+
+[mdformat](https://github.com/hukkin/mdformat) is a CommonMark compliant Markdown formatter.
+
+## Enabling mdformat
+
+Enabling with the `qlty` CLI:
+
+```bash
+qlty plugins enable mdformat
+```
+
+Or by editing `qlty.toml`:
+
+```toml
+# Always use the latest version
+[plugins.enabled]
+mdformat = "latest"
+
+# OR enable a specific version
+[plugins.enabled]
+mdformat = "X.Y.Z"
+```
+
+## Links
+
+- [mdformat on GitHub](https://github.com/hukkin/mdformat)
+- [mdformat plugin definition](https://github.com/qltysh/qlty/tree/main/plugins/linters/mdformat)
+- [mdformat releases](https://github.com/hukkin/mdformat/releases)
+- [Qlty's open source plugin definitions](https://github.com/qltysh/qlty/tree/main/plugins/linters)
+
+## License
+
+mdformat is licensed under the [MIT License](https://github.com/hukkin/mdformat/blob/master/LICENSE).

qlty-plugins/plugins/linters/mdformat/fixtures/__snapshots__/basic_v1.0.0.shot

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`linter=mdformat fixture=basic version=1.0.0 1`] = `
+{
+  "issues": [
+    {
+      "category": "CATEGORY_STYLE",
+      "level": "LEVEL_FMT",
+      "location": {
+        "path": "basic.in.md",
+      },
+      "message": "Incorrect formatting, autoformat by running \`qlty fmt\`.",
+      "mode": "MODE_BLOCK",
+      "onAddedLine": true,
+      "ruleKey": "fmt",
+      "tool": "mdformat",
+    },
+  ],
+}
+`;

qlty-plugins/plugins/linters/mdformat/fixtures/basic.in.md

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+# Heading
+
+This is a paragraph with    extra   spaces.
+
+*  Item 1
+*  Item 2
+*  Item 3

qlty-plugins/plugins/linters/mdformat/mdformat.test.ts

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+import { linterCheckTest } from "tests";
+
+linterCheckTest("mdformat", __dirname);

qlty-plugins/plugins/linters/mdformat/plugin.toml

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+config_version = "0"
+
+[plugins.definitions.mdformat]
+runtime = "python"
+package = "mdformat"
+file_types = ["markdown"]
+latest_version = "1.0.0"
+known_good_version = "1.0.0"
+version_command = "mdformat --version"
+description = "CommonMark compliant Markdown formatter"
+
+[plugins.definitions.mdformat.drivers.format]
+script = "mdformat ${target}"
+success_codes = [0]
+output = "rewrite"
+cache_results = true
+batch = true
+driver_type = "formatter"