PrometheusClientLayer: request_duration_seconds used in wrong

[Xuanwo]

https://opendal.apache.org/docs/rust/src/opendal/layers/prometheus_client.rs.html#535-554

request_duration_seconds should be updated with correct operation name.

[SheenLin]

hey @Xuanwo , I want to try it

[tisonkun]

@SheenLin Welcome and please go ahead!

[Xuanwo]

hey @Xuanwo , I want to try it

Hi, @SheenLin thanks for your interest! Our oio::Read has been refactored, which invalidate this issue. I will continue working on this now.