feat(go): add GoStructContextBuilder and GoStructContextBuilderTest

This commit adds the `GoStructContextBuilder` class, which is responsible for building the class context for Go struct types. It also adds the corresponding test class `GoStructContextBuilderTest`. These additions enhance the functionality of the Go plugin in Goland.

Author: phodal

goland/src/main/kotlin/cc/unitmesh/go/context/GoStructContextBuilder.kt

@@ -0,0 +1,40 @@
+package cc.unitmesh.go.context
+
+import cc.unitmesh.devti.context.ClassContext
+import cc.unitmesh.devti.context.builder.ClassContextBuilder
+import com.goide.psi.GoMethodDeclaration
+import com.goide.psi.GoTypeDeclaration
+import com.goide.psi.GoTypeSpec
+import com.intellij.psi.PsiElement
+
+class GoStructContextBuilder : ClassContextBuilder {
+    override fun getClassContext(psiElement: PsiElement, gatherUsages: Boolean): ClassContext? {
+        if (psiElement !is GoTypeDeclaration && psiElement !is GoTypeSpec) {
+            return null
+        }
+
+        val typeSpecs: List<GoTypeSpec> = when (psiElement) {
+            is GoTypeSpec -> listOf(psiElement)
+            is GoTypeDeclaration -> psiElement.typeSpecList
+            else -> emptyList()
+        }
+
+        val methodPairs = typeSpecs.flatMap { type ->
+            val methods = type.methods
+            methods.map { method -> method to type.name }
+        }
+
+        val methods = methodPairs.map { it.first }
+            .filterIsInstance<GoMethodDeclaration>()
+
+        val name = when (psiElement) {
+            is GoTypeSpec -> psiElement.name
+            is GoTypeDeclaration -> psiElement.text
+            else -> null
+        }
+
+        return ClassContext(
+            psiElement, psiElement.text, name, methods, emptyList(), emptyList(), emptyList()
+        )
+    }
+}

goland/src/main/resources/cc.unitmesh.goland.xml

@@ -2,9 +2,11 @@
     <!--suppress PluginXmlValidity -->
     <dependencies>
         <plugin id="org.jetbrains.plugins.go"/>
+        <plugin id="com.intellij.modules.goland"/>
     </dependencies>
 
     <extensions defaultExtensionNs="cc.unitmesh">
+        <classContextBuilder language="go" implementationClass="cc.unitmesh.go.context.GoStructContextBuilder"/>
         <methodContextBuilder language="go" implementationClass="cc.unitmesh.go.context.GoMethodContextBuilder"/>
 
         <chatContextProvider implementation="cc.unitmesh.go.provider.GoVersionChatContextProvider"/>

goland/src/test/kotlin/cc/unitmesh/go/context/GoStructContextBuilderTest.kt

@@ -0,0 +1,5 @@
+package cc.unitmesh.go.context;
+
+class GoStructContextBuilderTest {
+
+}