Highlight comments in module (#246)

Signed-off-by: Yan Zhang <[email protected]>

### Requirements

* Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
* All new code requires tests to ensure against regressions

### Description of the Change

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To enable comments and javadocs in `module`

### Alternate Designs
unknown
<!-- Explain what other alternates were considered and why the proposed version was selected -->

### Benefits
To fix part of #245 
<!-- What benefits will be realized by the code change? -->

### Possible Drawbacks
unknown
<!-- What are the possible side-effects or negative impacts of the code change? -->

### Applicable Issues

#245 
<!-- Enter any applicable Issues here -->

Author: Eskibear

grammars/java.cson

@@ -998,6 +998,12 @@
         'contentName': 'meta.module.body.java'
         'patterns': [
           # TODO: Write more rules for module grammar
+          {
+            'include': '#comments'
+          }
+          {
+            'include': '#comments-javadoc'
+          }
           {
             'match': '\\b(requires|transitive|exports|opens|to|uses|provides|with)\\b'
             'name': 'keyword.module.java'

spec/java-spec.coffee

@@ -209,6 +209,24 @@ describe 'Java grammar', ->
     expect(lines[2][3]).toEqual value: 'with', scopes: ['source.java', 'meta.module.java', 'meta.module.body.java', 'keyword.module.java']
     expect(lines[3][0]).toEqual value: '}', scopes: ['source.java', 'meta.module.java', 'punctuation.section.module.end.bracket.curly.java']
 
+  it 'tokenizes comments inside module', ->
+    lines = grammar.tokenizeLines '''
+      module com.foo.bar {
+        // comments
+        /* comments */
+        /** javadoc */
+        requires java.base;
+      }
+    '''
+
+    expect(lines[0][0]).toEqual value: 'module', scopes: ['source.java', 'meta.module.java', 'storage.modifier.java']
+    expect(lines[0][4]).toEqual value: '{', scopes: ['source.java', 'meta.module.java', 'punctuation.section.module.begin.bracket.curly.java']
+    expect(lines[1][2]).toEqual value: ' comments', scopes: ['source.java', 'meta.module.java', 'meta.module.body.java', 'comment.line.double-slash.java']
+    expect(lines[2][2]).toEqual value: ' comments ', scopes: ['source.java', 'meta.module.java', 'meta.module.body.java', 'comment.block.java']
+    expect(lines[3][2]).toEqual value: ' javadoc ', scopes: ['source.java', 'meta.module.java', 'meta.module.body.java', 'comment.block.javadoc.java']
+    expect(lines[4][1]).toEqual value: 'requires', scopes: ['source.java', 'meta.module.java', 'meta.module.body.java', 'keyword.module.java']
+    expect(lines[5][0]).toEqual value: '}', scopes: ['source.java', 'meta.module.java', 'punctuation.section.module.end.bracket.curly.java']
+
   it 'tokenizes classes', ->
     lines = grammar.tokenizeLines '''
       class Thing {