Introduced debug methods for computable messages

To avoid heavy computations in `debug` statements we now need to pollute code with explicit checking for `isDebugEnabled()`

IDEA-CR-38619

(cherry picked from commit 895497f2)

(cherry picked from commit 597031fe)

platform/util/src/com/intellij/openapi/diagnostic/Logger.java

 // Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.openapi.diagnostic;
 
+import com.intellij.openapi.util.Computable;
 import com.intellij.util.ArrayUtil;
 import com.intellij.util.ExceptionUtil;
 import com.intellij.util.Function;
@@ -81,10 +82,22 @@ public abstract class Logger {
 
   public abstract void debug(String message);
 
+  public final void debug(@NotNull Computable<String> messageComputable) {
+    if (isDebugEnabled()) {
+      debug(messageComputable.compute());
+    }
+  }
+
   public abstract void debug(@Nullable Throwable t);
 
   public abstract void debug(String message, @Nullable Throwable t);
 
+  public final void debug(@NotNull Computable<String> messageComputable, @Nullable Throwable t) {
+    if (isDebugEnabled()) {
+      debug(messageComputable.compute(), t);
+    }
+  }
+
   public void debug(@NotNull String message, @NotNull Object... details) {
     if (isDebugEnabled()) {
       StringBuilder sb = new StringBuilder();