Move ActionInputPrefetcher to the actions package

The plan is to add it to ActionExecutionContext, which is also there.

PiperOrigin-RevId: 162656835
diff --git a/src/main/java/com/google/devtools/build/lib/buildtool/ExecutionTool.java b/src/main/java/com/google/devtools/build/lib/buildtool/ExecutionTool.java
index 8c01bd0..bd44d70 100644
--- a/src/main/java/com/google/devtools/build/lib/buildtool/ExecutionTool.java
+++ b/src/main/java/com/google/devtools/build/lib/buildtool/ExecutionTool.java
@@ -35,6 +35,7 @@
 import com.google.devtools.build.lib.actions.ActionContextMarker;
 import com.google.devtools.build.lib.actions.ActionGraph;
 import com.google.devtools.build.lib.actions.ActionInputFileCache;
+import com.google.devtools.build.lib.actions.ActionInputPrefetcher;
 import com.google.devtools.build.lib.actions.Artifact;
 import com.google.devtools.build.lib.actions.ArtifactFactory;
 import com.google.devtools.build.lib.actions.BuildFailedException;
@@ -65,7 +66,6 @@
 import com.google.devtools.build.lib.events.Reporter;
 import com.google.devtools.build.lib.exec.ActionContextConsumer;
 import com.google.devtools.build.lib.exec.ActionContextProvider;
-import com.google.devtools.build.lib.exec.ActionInputPrefetcher;
 import com.google.devtools.build.lib.exec.BlazeExecutor;
 import com.google.devtools.build.lib.exec.CheckUpToDateFilter;
 import com.google.devtools.build.lib.exec.ExecutionOptions;