[HUDI-137] Hudi cleaning state changes should be consistent with compaction actions

Before this change, Cleaner performs cleaning of old file versions and then stores the deleted files in .clean files.
With this setup, we will not be able to track file deletions if a cleaner fails after deleting files but before writing .clean metadata.
This is fine for regular file-system view generation but Incremental timeline syncing relies on clean/commit/compaction metadata to keep a consistent file-system view.

Cleaner state transitions is now similar to that of compaction.

1. Requested : HoodieWriteClient.scheduleClean() selects the list of files that needs to be deleted and stores them in metadata
2. Inflight : HoodieWriteClient marks the state to be inflight before it starts deleting
3. Completed : HoodieWriteClient marks the state after completing the deletion according to the cleaner plan

hudi-common/src/main/avro/HoodieCleanerPlan.avsc

@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+{
+  "namespace": "org.apache.hudi.avro.model",
+  "type": "record",
+  "name": "HoodieCleanerPlan",
+  "fields": [
+    {
+      "name": "earliestInstantToRetain",
+      "type":["null", {
+        "type": "record",
+        "name": "HoodieActionInstant",
+        "fields": [
+          {
+            "name": "timestamp",
+            "type": "string"
+          },
+          {
+            "name": "action",
+            "type": "string"
+          },
+          {
+            "name": "state",
+            "type": "string"
+          }
+        ]
+      }],
+      "default" : null
+    },
+    {
+      "name": "policy",
+      "type": "string"
+    },
+    {
+      "name": "filesToBeDeletedPerPartition",
+      "type": [
+        "null", {
+        "type":"map",
+        "values": {
+          "type":"array",
+          "items":{
+            "name":"filePath",
+            "type": "string"
+          }
+      }}],
+      "default" : null
+    },
+    {
+      "name":"version",
+      "type":["int", "null"],
+      "default": 1
+    }
+  ]
+}