feat: Add auto-labeling for issues based on their titles

[ttizze]

Summary by CodeRabbit

### リリースノート

#### New Feature
- GitHub Actionsを使用して、問題のタイトルに基づいて自動的にラベルを付ける「Auto Label Issue」ワークフローが追加されました。特定のキーワード（例：`feat:`, `fix:`, `docs:`など）に基づいてラベルが決定され、該当するラベル（例：`feature`, `bug`, `documentation`など）が問題に追加されます。デフォルトでは「task」ラベルが適用されます。

[github-actions]

CodeRabbit

### ウォークスルー
この変更は、GitHub Actionsを使用して問題のタイトルに基づいて自動的にラベルを付けるワークフロー「Auto Label Issue」を追加します。特定のキーワードに基づいて適切なラベルが問題に追加されます。

### 変更点
| ファイル | 要約 |
| --- | --- |
| .github/workflows/auto-label-issue.yml | GitHub Actionsを使用して、問題のタイトルに基づいて自動的にラベルを付けるワークフローを追加。特定のキーワードに基づいてラベルが決定され、デフォルトでは「task」ラベルが適用される。 |

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[github-actions]

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Commits

Files that changed from the base of the PR and between 173f683 and 7bca877 commits.

Files selected (1)

• .github/workflows/auto-label-issue.yml (1)

Review comments generated (3)

• Review: 2
• LGTM: 1

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Commits

Files that changed from the base of the PR and between 7bca877 and b11d95a commits.

Files selected (1)

• .github/workflows/auto-label-issue.yml (1)

Review comments generated (1)

• Review: 1
• LGTM: 0

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Commits

Files that changed from the base of the PR and between b11d95a and b567c4a commits.

Files selected (1)

• .github/workflows/auto-label-issue.yml (1)

Review comments generated (1)

• Review: 0
• LGTM: 1

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