new feature: add throttle for more operations

### Feature Description

Hi team, if I don't read the [code](https://github.com/apache/opendal/blob/main/core/layers/throttle/src/lib.rs) wrong currently only write operation is throttled. I'm wondering if we could support more operations?

### Problem and Solution

Add throttle support for more operations.

### Additional Context

_No response_

### Are you willing to contribute to the development of this feature?

- [ ] Yes, I am willing to contribute to the development of this feature.

Start with core/layers/throttle/src/lib.rs and trace how throttling currently applies to write operations. Clarify which additional operations are in scope before changing the layer, then add coverage for the agreed behavior; done means those operations are throttled consistently and the existing behavior remains covered.

Written by the indexing model from the issue text.