[Refactoring] Reduce the OAuth dependency about specific platform

[Hyeon-Uk]

What's Problem?

Previously, I implemented an OAuth Login Service that is highly dependent on the Kakao Platform

I'll be refactoring this strong dependency to make it easier to extend the social login offered by multiple platforms.

How?

Refactoring code in an object-oriented manner using the function provided by spring security

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Expected!

Can extend and maintain social login platform easier!