Breaking Change: Remove @cached

[elwayman02]

Now that it's built into Ember, we should deprecate @cached in this library and release a major version dropping support versions for Ember prior to it being added (4.1, I think?).

[NullVoxPopuli]

if the behavior is the same, the implementation could be a re-export, no need for breaking change.

and then we could deprecate usage of @cached from this library -- and provide a codemod to move to built in

[SergeAstapov]

re-export with deprecation seems feasible to me.

as for codemod, seems like could be similar to https://github.com/ijlee2/ember-codemod-remove-inject-as-service