[Feat] PR assignee, reviewer 자동으로 채우기

[eonseok-jeon]

Related Issue : Closes #250

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🧑‍🎤 Summary

• pr 올리면 자동으로 reviewers와 assignees 채워지도록 github actions 구현

🧑‍🎤 Comment

Auto Assign Action을 이용해서 구현해줬어요

on:
  pull_request:
    types: [opened, ready_for_review, reopened]

• opened -> pr open 시
• ready_for_review -> draft에서 open으로 변경 시
• reopened -> pr reopen 시

3가지 경우에 대해 자동으로 처리하도록 해줬어요

addReviewers: true

addAssignees: author

reviewers:
  - eonseok-jeon
  - lydiacho

numberOfReviewers: 0

addAssignees를 통해 pr 올린 사람으로 자동 assignee 설정 되도록 하였고
numberOfReviewers를 0으로 설정하여 reviewers에 있는 본인 제외 모든 사람이 reviewer로 등록되도록 구현했어요 :)

[height]

Link Height tasks by mentioning a task ID in the pull request title or commit messages, or description and comments with the keyword link (e.g. "Link T-123").

💡Tip: You can also use "Close T-X" to automatically close a task when the pull request is merged.

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[lydiacho]

너무 좋습니다 감사합니다 ~ 🚀