Add dimension partitioningType to metrics to track usage of different partitioning schemes

[kfaraz]

Changes

• Add method ShardSpec.getType() to get name of shard spec type
• List all names of shard spec types in the interface ShardSpec itself
  for easy reference and maintenance
• Add dimension partitioningType to metric segment/added/bytes

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This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.

[abhishekagarwal87]

LGTM

[abhishekagarwal87]

merged since ci failure is unrelated