✨ (server): Add popularTags query

[tkhwang]

Description

Type of change

popular tags query 추가하기

• No pagiation.
• howMany parameter input 받아서 가장 유명한 howMany 개의 popular tag 조회

query PpopularTags($getPopularTagsWithAuthInput: GetPopularTagsWithAuthInput!) {
  popularTags(getPopularTagsWithAuthInput: $getPopularTagsWithAuthInput) {
    id
    tag
    normalizedTag
    imageUrl
    followersCount
    userBookmarksCount
    isFollowingTag
  }
}

        "popularTags": [
            {
                "id": "81f2d610-1fa7-4397-86d2-9703b008d6a9",
                "tag": "typescript",
                "normalizedTag": "typescript",
                "imageUrl": "https://readable-2021-dev.s3.ap-northeast-2.amazonaws.com/tags/typescript.jpg",
                "followersCount": 1,
                "userBookmarksCount": 4,
                "isFollowingTag": true
            },

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

Further to-do lists

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