could we add leading/trailing edge options for debounce?

This is more of a feature request than a bug. If you think this feature might make sense then maybe I will raise a PR for it.

Could we add options for debounce to configure whether the saga is called on the leading edge and/or the trailing edge? (Compare to the lodash debounce function).

This would be a very useful feature because by setting leading: true I can ensure I respond immediately to user actions without having to wait for the debounce period to expire.

Perhaps the first delayLength parameter could either be number, or an options object like { delayLength: number; leading?: boolean; trailing?: boolean }?