add tree_string #90
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add tree_string #90
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Don't merge this till it's working.
Method that I tried to copy from Spark source code: https://github.com/apache/spark/blob/edf4ac4b518d0d69f7012ff5c0f1428fe45412ba/sql/api/src/main/scala/org/apache/spark/sql/types/StructType.scala#L399
Purpose: give users a better experience for analyzing diffs between two schemas with nested fields that are hard to read in the terminal.