Reimplement MD040/fenced-code-language using micromark tokens.

test/md040-language_only.md

@@ -3,13 +3,13 @@
 Fence code block information with leading whitespace:
 
 ```  html
-<h1>markdownlint</h1> {MD040:5}
+<h1>markdownlint</h1>
 ```
 
 Fence code block information with trailing whitespace:
 
 ```css 
-body {} {MD040:11} {MD009:11}
+body {} {MD009:11}
 ```
 
 Fence code block information with extra data:

test/snapshots/markdownlint-test-scenarios.js.md

@@ -34755,7 +34755,7 @@ Generated by [AVA](https://avajs.dev).
           ],
         },
         {
-          errorContext: '  ```',
+          errorContext: '```',
           errorDetail: null,
           errorRange: null,
           fixInfo: null,
@@ -38128,33 +38128,7 @@ Generated by [AVA](https://avajs.dev).
         },
         {
           errorContext: null,
-          errorDetail: 'Info string contains more than language: "  html"',
-          errorRange: null,
-          fixInfo: null,
-          lineNumber: 5,
-          ruleDescription: 'Fenced code blocks should have a language specified',
-          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md040.md',
-          ruleNames: [
-            'MD040',
-            'fenced-code-language',
-          ],
-        },
-        {
-          errorContext: null,
-          errorDetail: 'Info string contains more than language: "css "',
-          errorRange: null,
-          fixInfo: null,
-          lineNumber: 11,
-          ruleDescription: 'Fenced code blocks should have a language specified',
-          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md040.md',
-          ruleNames: [
-            'MD040',
-            'fenced-code-language',
-          ],
-        },
-        {
-          errorContext: null,
-          errorDetail: 'Info string contains more than language: "html version=5"',
+          errorDetail: 'Info string contains more than language: "```html version=5"',
           errorRange: null,
           fixInfo: null,
           lineNumber: 17,
@@ -38171,13 +38145,13 @@ Generated by [AVA](https://avajs.dev).
       Fence code block information with leading whitespace:␊
       ␊
       \`\`\`  html␊
-      <h1>markdownlint</h1> {MD040:5}␊
+      <h1>markdownlint</h1>␊
       \`\`\`␊
       ␊
       Fence code block information with trailing whitespace:␊
       ␊
       \`\`\`css␊
-      body {} {MD040:11} {MD009:11}␊
+      body {} {MD009:11}␊
       \`\`\`␊
       ␊
       Fence code block information with extra data:␊