add ability to customize json (and auto) column physical storage details on per column basis

[clintropolis]

Description

changes:

• NestedDataColumnSchema and AutoTypeColumnSchema now accept a NestedCommonFormatColumn as a new 'columnFormatSpec' property, which allows customizing how json and auto columns are compressed, how strings are encoded in dictionaries, etc, on a per column level. The nested column format spec has several properties: objectKeysEncoding, objectStorageEncoding, objectStorageCompression, stringDictionaryEncoding, dictionaryEncodedColumnCompression, longColumnEncoding, longColumnCompression, doubleColumnCompression NestedCommonFormatColumn blends in segment level config from IndexSpec to populate any values not explicitly specified with segment level.
• JSON field names can now be stored with front-coding with columnFormatSpec property objectKeysEncoding
• Adds 'druid.indexing.formats.nestedColumnFormatSpec' to define a default NestedCommonFormatColumn

Release note

todo

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This PR has:

• been self-reviewed.
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• 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.