re-thinking function names or acts on service() and shared_service()

Two functions, ``service()`` and ``shared_service()`` make somebody think that service class returns new instance typically. At first, it was right.
It is turned over by github issue #55. Now, Service class returns shared instance by default.

I think ``service()`` should return shared instance, but I cannot judge whether we should do or not do from now.

Yes, you're correct. It's long been on my mental to-do list

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https://github.com/bcit-ci/CodeIgniter4/...fe87225662

Thank you for fixing it!

Oh, dang! Sorry I forgot to let you know. My bad. But, you're welcome.

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