feat(highlight): add syntax highlighting for Shire language

Add DevInHighlightingAnnotator to provide basic identifier highlighting for Shire language in DevIn plugin. This enhances code readability in the IDE.

Author: phodal

exts/devins-lang/src/main/kotlin/cc/unitmesh/devti/language/highlight/DevInHighlightingAnnotator.kt

@@ -0,0 +1,21 @@
+package cc.unitmesh.devti.language.highlight
+
+import cc.unitmesh.devti.language.psi.DevInTypes
+import com.intellij.lang.annotation.AnnotationHolder
+import com.intellij.lang.annotation.Annotator
+import com.intellij.lang.annotation.HighlightSeverity
+import com.intellij.openapi.editor.DefaultLanguageHighlighterColors
+import com.intellij.psi.PsiElement
+import com.intellij.psi.util.PsiUtilCore
+
+class DevInHighlightingAnnotator : Annotator {
+    override fun annotate(element: PsiElement, holder: AnnotationHolder) {
+        when (PsiUtilCore.getElementType(element)) {
+            DevInTypes.IDENTIFIER -> {
+                holder.newSilentAnnotation(HighlightSeverity.INFORMATION)
+                    .textAttributes(DefaultLanguageHighlighterColors.IDENTIFIER)
+                    .create()
+            }
+        }
+    }
+}

exts/devins-lang/src/main/resources/cc.unitmesh.devti.language.xml

@@ -24,6 +24,8 @@
         <lang.syntaxHighlighterFactory language="DevIn"
                                        implementationClass="cc.unitmesh.devti.language.highlight.DevInSyntaxHighlighterFactory"/>
 
+        <annotator language="Shire" implementationClass="cc.unitmesh.devti.language.highlight.DevInHighlightingAnnotator"/>
+
         <lang.ast.factory language="DevIn"
                           implementationClass="cc.unitmesh.devti.language.DevInAstFactory"/>