feat: CheckoutSessionsの重複するステータス定義を CheckoutSessionStatus スキーマへ一本化 (#54)

[reiroop]

本PRは、Issue #54 に基づき、Checkout Sessions の一覧取得パラメータおよびレスポンス内で重複していたステータス定義を共通の CheckoutSessionStatus スキーマに一本化し、DRY原則を適用します。本ブランチは #57 (feature/issue-15) の上に重ねています。

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