Fix Flight LargeList schema encoding

[yinli-systems]

Which issue does this PR close?

• Closes Schema for LargeList in Flight data encoder #10291.

Rationale for this change

prepare_field_for_flight rebuilds DataType::LargeList with Field::new_list, silently changing the 64-bit offset type into a regular List in the Flight schema. The adjacent ListView / LargeListView path already preserves its large variant.

What changes are included in this PR?

• Use Field::new_large_list for DataType::LargeList.
• Exercise a real FlightDataEncoder to FlightDataDecoder IPC round trip covering List, nested LargeList<List>, FixedSizeList, parent and child nullability, and schema/field/child metadata.

Are these changes tested?

Yes, locally with Rust 1.96.1 on macOS:

• Fault injection with the old new_list implementation: the round-trip regression test fails because decoded LargeList becomes List.
• cargo test -p arrow-flight test_list_schema_round_trip
• cargo test -p arrow-flight --lib (42 passed)
• cargo test -p arrow-flight (unit, client, encode/decode, and doc tests passed)
• cargo clippy -p arrow-flight --all-targets --all-features -- -D warnings
• cargo fmt --all -- --check
• git diff --check

I used AI assistance to inspect the nearby Flight schema-preparation paths and help generate the focused round-trip regression, then reviewed the resulting one-line production fix and validated it with the commands above.

Are there any user-facing changes?

Yes. Flight-encoded schemas now preserve LargeList instead of exposing it as List after schema preparation.