Move Install op executor to a separate file

This CL onnly moves code around, no actual changes

Test: th

Change-Id: Iea041d5d1b2fc34338349fb4045a79615193348f
diff --git a/Android.bp b/Android.bp
index d74e78f..a37a34f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -232,6 +232,7 @@
         "payload_consumer/file_descriptor_utils.cc",
         "payload_consumer/file_writer.cc",
         "payload_consumer/filesystem_verifier_action.cc",
+        "payload_consumer/install_operation_executor.cc",
         "payload_consumer/install_plan.cc",
         "payload_consumer/mount_history.cc",
         "payload_consumer/payload_constants.cc",
@@ -805,6 +806,7 @@
         "payload_consumer/file_writer_unittest.cc",
         "payload_consumer/filesystem_verifier_action_unittest.cc",
         "payload_consumer/install_plan_unittest.cc",
+        "payload_consumer/install_operation_executor_unittest.cc",
         "payload_consumer/partition_update_generator_android_unittest.cc",
         "payload_consumer/postinstall_runner_action_unittest.cc",
         "payload_consumer/verity_writer_android_unittest.cc",