'Encoding DELTA_BYTE_ARRAY is not supported' with parquet arrow readers

[ilya-biryukov]

Describe the bug
Reading parquet files with byte arrays encoded using DELTA_BYTE_ARRAY causes the error mentioned from the title.
Corresponding fields must be of UTF8 converted type.

To Reproduce
Steps to reproduce the behavior:

1. read parquet file with strings encoded as DELTA_BYTE_ARRAY with parquet's arrow readers.

Expected behavior

1. file reads with no error

Actual: the aforementioned error is produced.

Additional context
We fixed this in our fork, I'll send a PR for review and further discussion soon.