feat: Create BaseIngestionMode.pdl (#349)

* Add writeMode to BaseVersionedAspect.pdl

* Fix typo

* Fix

* Change comment format

* Fix typo

* Moving writeMode to BaseIngestionMode.pdl

* Update enum

* Update model

dao-api/src/main/pegasus/com/linkedin/metadata/events/BaseIngestionMode.pdl

@@ -0,0 +1,24 @@
+namespace com.linkedin.metadata.events
+
+/**
+* A base record containing ingestion mode of aspects
+* Usage: Aspects can include this record to specify ingestion mode
+*/
+record BaseIngestionMode {
+
+ /**
+ * Mode used when writing aspect metadata into backend
+ */
+ writeMode: optional enum WriteMode {
+   /**
+   * Default write mode. Same behavior as not setting writeMode
+   */
+   DEFAULT
+
+   /**
+   * Override checks that may skip metadata write (eg equality check)
+   */
+   OVERRIDE
+ }
+
+}