[Feature] support time

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Description

I want a way to get the exact time in the function running.
While I know there are some ways to get the time, there is no way to update the time while executing the code.

`Instant::now();` is not supported yet and the current workaround is either using the js `js_sys::Date::new_0();` or by using the instant crate [instant](https://github.com/sebcrozet/instant)

The issue only identifies Instant::now(), js_sys::Date::new_0(), and the instant crate as relevant entry points; start by locating how time APIs are exposed in workers-rs and where the runtime's current time can be queried. Define the supported behavior and add coverage for exact time during execution; the issue provides no file or test names, so scope needs maintainer clarification first.

Written by the indexing model from the issue text.