perf(provider): wrap file search in runReadAction

- Encapsulate the file search logic within a runReadAction block
- This change ensures that the file search operation is performed in a read action, improving thread safety and performance in multi-threaded environments

Author: phodal

java/src/main/kotlin/cc/unitmesh/idea/provider/JavaRefactoringTool.kt

@@ -27,8 +27,10 @@ class JavaRefactoringTool : RefactoringTool {
         val className = elementInfo.className
         val packageName = elementInfo.pkgName
 
-        val sourceFile = javaFiles.firstOrNull {
-            it.packageName == packageName && it.name == "$className.java"
+        val sourceFile = runReadAction {
+            javaFiles.firstOrNull {
+                it.packageName == packageName && it.name == "$className.java"
+            }
         } ?: return null
 
         return sourceFile