services/s3: Implement anonymous read support

[Xuanwo]

Signed-off-by: Xuanwo github@xuanwo.io

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

Implement anonymous read support

Fix #54

[BohuTANG]

Thank you, @Xuanwo
Do you have the plan to release a new version? Databend need this :)

[Xuanwo]

Thank you, @Xuanwo Do you have the plan to release a new version? Databend need this :)

Cool, let's do this.