Round trip FIXED_LEN_BYTE_ARRAY data properly in Parquet writer

[etseidl]

Description

#13437 added the ability to consume FIXED_LEN_BYTE_ARRAY encoded data and represent it as lists of UINT8. When trying to write this data back to Parquet there are two problems. 1) the notion of fixed length is lost, and 2) the UINT8 data is written as a list of INT32 which can quadruple the storage required. This PR addresses both issues by adding fields to the input and output metadata to allow for preserving the form of the original data.

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [x] The documentation is up to date with these changes.

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[etseidl]

CC @vuule

[vuule]

/ok to test

[vuule]

/ok to test

[vuule]

/ok to test

[vuule]

/merge