Allow passing multiple actors to Flipper.enabled?

[jnunemaker]

Before:

[user, team, org].any? { |actor| Flipper.enabled?(:some_feature, actor) }

After:

Flipper.enabled?(:some_feature, [user, team, org])

The biggest benefit is not re-running all the gates and instrumentation for every actor and every gate. Instead this runs the boolean and & of time once. Then it just checks multiple actors in the actor, % of actors and group gates.

I'm going to give this another pass to see if anything needs to change back or not.

[jnunemaker]

Forgot to drop here that checking 5 actors at once vs 5 enabled checks with 1 actor each is like 5x faster so that's good!