Feature Request: API to expose underlying memory profiling stats

Hi!

I'm working on a project that already uses `foundations` and exposes a telemetry server running in a background `tokio` task, with memory profiling enabled. I have a use case where I'd like to query my current memory usage from within this process to make some runtime determinations. I'm able to do this by importing `tikv_jemalloc_ctl` directly and using its API, but it feels in-scope for `foundations` to expose this without needing to reach for the lower-level library.

Would it be possible to pass-through `tikv_jemalloc_ctl::stats` in some way, to query the actual stats available there from within the process using foundations?

Thanks for your work on this, love the library!