Returns an existing Scope with the same name

[Tiscs]

Returns an existing Scope with the same name when calling Scope(name string, opts ...ScopeOption) rather than creating a new one.

[CLAassistant]

All committers have signed the CLA.

[JacobOaks]

Hi @Tiscs, in its current state this is a breaking change because it was cause all current calls to Scope() with the same name to be merged into one scope which could break some users.

Instead, we could add a new API to scope that returns a child subscope with a given name, or perhaps an Option that you pass when creating the container that enables this behavior. Let me know your thoughts!