Keep promises and active bindings in globalenv

[renkun-ken]

What problem did you solve?

Close #520

This PR uses rlang::env_binding_are_lazy() and rlang::env_binding_are_active() to know which symbols are promises and active bindings so that they are not forced on task callback to write globalenv info.

(If you have)Screenshot

(If you do not have screenshot) How can I check this pull request?

Run the following code in the global environment:

x <- 1
delayedAssign("d", 1)
delayedAssign("err", stop("err"))
makeActiveBinding("a1", function() 1, environment())

No promise or active binding are forced.

[ManuelHentschel]

LGTM, thanks!