feat: Add body_text and body_html to Comment model (#832)

* feat: add body_text and body_html to Comment model

* Refactor GitHub Actions for Rust CI workflow

Updated Rust CI workflow to use actions/checkout@v5 and added caching steps.

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Co-authored-by: Dmytro Horskyi <dmgorsky@gmail.com>

Author: pnevyk

src/models/pulls.rs

@@ -276,6 +276,10 @@ pub struct Comment {
     pub in_reply_to_id: Option<CommentId>,
     pub user: Option<Author>,
     pub body: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub body_text: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub body_html: Option<String>,
     pub created_at: chrono::DateTime<chrono::Utc>,
     pub updated_at: chrono::DateTime<chrono::Utc>,
     pub html_url: String,