add IdType as an OOB type in TypeSystem; use it when exposing Trait instance info; introduce PathExpression

BUG-32815 BUG-32816 BUG-32827 Entity Trait Management Backend API. Contributed by Venkatesh Seetharam

add -ve test for BUG-32568; fix tests to run after refactor: add back application.conf; fix assertions

BUG-32815 BUG-32816 BUG-32827 Entity Trait Management Backend API. Contributed by Venkatesh Seetharam

crawl.

after they are created so nesting works correctly.

Adds Apache License Headers, enables rat-check, find-bugs and checkstyle plugins. Contributed by Venkatesh Seetharam

broken out properly

instead of prop file.

Fixed hive model: StorageDescription is now a class, removed creating a duplicate storagedesc per partition (need to fix handling of partitions that can diverge).
  Made mem repository test work again.
Validated changes with TPCDS.  Fixed empty array handling in Graph repo

GraphBackendDiscoveryService as it relates to the graph directly.  The
code was inactive but remains commented as a reminder for future work.

org.apache.hadoop.metadata.discovery.GraphBackedDiscoveryService.  Will
need additional clean up, but the functionality remains the same.

Adds Apache License Headers, enables rat-check, find-bugs and checkstyle plugins. Contributed by Venkatesh Seetharam