feat(build): add feature gate for io-uring

[MrCroxx]

What's changed and what's your intention?

Please explain IN DETAIL what the changes are in this PR and why they are needed. :D

As a mitigation for apache/opendal#7619

Checklist

• I have written the necessary rustdoc comments
• I have added the necessary unit tests and integration tests
• I have passed cargo x (or cargo x --fast instead if the old tests are not modified) in my local environment.

Related issues or PRs (optional)

apache/opendal#7619

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
foyer-bench/src/main.rs	69.79% <ø> (-0.23%)	⬇️
foyer-storage/src/io/engine/mod.rs	93.33% <ø> (ø)

... and 4 files with indirect coverage changes

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