parquet: use flatbuffers to store metadata (WIP) #9042
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Which issue does this PR close?
Rationale for this change
See #9041 and apache/arrow#48431
What changes are included in this PR?
Rough draft. WIP. Do not merge. This adds a fbs file, thirft -> flatbuffers, flatbuffers -> thrift converters.
Are these changes tested?
Not yet. WIP.
Are there any user-facing changes?
This change should provide an option to store the flatbuffers metadata field to field, but otherwise be opaque to the user.