✨ (server): Add user follow feature

[tkhwang]

Description

Type of change

• Add user follow feature.

• 유저 follow 한 이후에 follower, following 유저 정보를 바로 update 하기 위하여 return 으로 followerUser 와 followingUser 를 내려줌.

• [ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)

• [X] ✨ New feature (non-breaking change which adds new functionality)

• [ ] 🐛 Bug fix (non-breaking change which fixes an issue)

• [ ] ♻️ Refactor (non-breaking change which refactors code)

• [ ] 🩹 Chore (non-breaking change which changes the small things)

• [ ] 📝 This change requires a documentation update

User

• user 아래에 followerUsers, followingUsers 필드 추가하여 바로 볼 수 있게 함.

{
    "data": {
        "me": {
            "id": "652964eb-e04a-4e2a-8d5e-62933d4462d7",
            "name": "tk HWANG",
            "provider": "Google",
            "providerId": "107855374156215311068",
            "avatarUrl": "https://lh3.googleusercontent.com/a-/AOh14Gg3DyXxT3B_8hm3nSnHm2_H8mIY-PHny_MHVRwexg=s96-c",
            "followerUsers": [
                {
                    "id": "80fe9d6b-5254-46ec-8e79-ad1a82268ba3",
                    "name": "이지은"
                }
            ],
            "followingUsers": []
        }
    }
}

Follow/Unfollow

follow/unfollow 결과로 바뀐 상황을 바로 client render 할 수 있도록 변경된 follow 관련 정보를 함께 내려줌.

{
    "data": {
        "followUserWithAuth": {
            "followerUser": {
                "id": "652964eb-e04a-4e2a-8d5e-62933d4462d7",
                "name": "tk HWANG",
                "provider": "Google",
                "providerId": "107855374156215311068",
                "avatarUrl": "https://lh3.googleusercontent.com/a-/AOh14Gg3DyXxT3B_8hm3nSnHm2_H8mIY-PHny_MHVRwexg=s96-c",
                "followerUsers": [
                    {
                        "id": "80fe9d6b-5254-46ec-8e79-ad1a82268ba3",
                        "name": "이지은"
                    }
                ],
                "followingUsers": []
            },
            "followingUser": {
                "id": "80fe9d6b-5254-46ec-8e79-ad1a82268ba3",
                "name": "이지은",
                "provider": "Google",
                "providerId": "111949040426936251051",
                "avatarUrl": "https://lh3.googleusercontent.com/a/AATXAJxaxpiERtI-E2AhehAjMU1993rYVGF2LqCZqIpW=s96-c",
                "followerUsers": [],
                "followingUsers": [
                    {
                        "id": "652964eb-e04a-4e2a-8d5e-62933d4462d7",
                        "name": "tk HWANG"
                    }
                ]
            }
        }
    }
}

Further to-do lists

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