[Profiler][Trivial] Cleanup ExperimentalConfig (#83890)
I'm trying to limit how much is in headers to make it easier to read the API surface. In a similar vein, we can replace `hasOptions` with `operator bool` so it just does the right thing in the check.
Differential Revision: [D38917366](https://our.internmc.facebook.com/intern/diff/D38917366/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83890
Approved by: https://github.com/slgong-fb
