Take 2: Refactor hoodie-common and create right abstractions for Hoodie Storage V2.0

- Refactored timelines to be a single timeline for all active events and one for archived events. CommitTimeline and other timelines can be inferred by applying a filter on the activeTimelime
- Introduced HoodieInstant to abstract different types of action, commit time and if isInFlight
- Implemented other review comments

hoodie-common/src/main/java/com/uber/hoodie/common/model/HoodieFileFormat.java

@@ -16,12 +16,12 @@
 
 package com.uber.hoodie.common.model;
 
-public enum HoodieStorageType {
+public enum HoodieFileFormat {
     PARQUET(".parquet");
 
     private final String extension;
 
-    HoodieStorageType(String extension) {
+    HoodieFileFormat(String extension) {
         this.extension = extension;
     }