Restore bindToContext functionality

[markfields]

After discussing the challenges being faced by our internal partners integrating the 2.0.0-internal.1.1.x release due to the removal of bindToContext (see #10627), we're adding it back in. They are tracking the work required to fully migrate off the request pattern to using handles, which will render this fully obsolete and at that point we will remove it.

Does this introduce a breaking change?

No... it undoes a breaking change, such that this change is additive.

Same change going into release/v2int/1.1 is #12048