Support alias disabling during workflow/activity registration

[cretz]

What was changed

Add worker.Options.DisableRegistrationAliasing (and worker.WorkflowReplayerOptions.DisableRegistrationAliasing and testsuite.WorkflowTestSuite.DisableRegistrationAliasing) to opt-out of registration aliasing which we strongly recommend (I would love to make this default, but can't due to compatibility concerns).

Why?

Did you know that today, if you register foo() with custom name "bar" and register baz() with custom name "foo", when you invoke using the string name "foo", you will actually execute foo()?

Did you know that today, if you register pkga.foo() with no custom name and then register pkgb.foo() with custom name "bar", when you invoke using the function reference pkga.foo, you will actually call pkgb.foo()?

This is wrong but unchangeable since people may inadvertently rely on such behavior. Rather, we now have a way to opt-out of this bad behavior. It is that second "Did you know" above that is the justification for putting this as a worker-level option instead of a register-option when registering.

Checklist

1. Closes Allow disabling of function name aliasing during registration #672
2. Closes Activity function alias lookup is done even on different task queue #845