[Format] Define Canonical Extension Type for FILE type
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Component: Format
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
The Parquet format specification recently added the `FILE` LogicalType ([parquet-format#585](https://github.com/apache/parquet-format/pull/585)), with corresponding Parquet C++ reader/writer support currently underway in Arrow ([#50891](https://github.com/apache/arrow/issues/50891) / [#50892](https://github.com/apache/arrow/pull/50892)). To support file references seamlessly across Arrow in-memory buffers, IPC streams, Arrow Flight, and language bindings, Arrow needs a corresponding Canonical Extension Type.
### Component(s)
Format
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