docs(parquet): add OpenDAL read and write example - #11014
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Which issue does this PR close?
Related to #10308.
Rationale for this change
Demonstrate how to use OpenDAL with Parquet's generic async I/O interfaces, alongside the existing object_store example.
What changes are included in this PR?
Add an in-memory read/write example with AsyncFileReader and AsyncFileWriter adapters and a SpawnedReader demonstration. Point application developers to parquet_opendal for ready-made adapters. OpenDAL 0.59 is a development dependency with only the memory service enabled.
Are these changes tested?
The example asserts that both ordinary and dedicated-runtime reads reproduce the written RecordBatch. Formatting and whitespace checks pass.
Are there any user-facing changes?
A new example, runnable with
cargo run -p parquet --example opendal --features async. No public API changes. OpenDAL 0.59 requires Rust 1.91, above this workspace's declared Rust 1.88 MSRV; this affects development targets that resolve/build the new dependency.