chore: format and improve documentation for Slack FDW

- Add detailed module documentation for better API reference
- Improve struct field and method documentation
- Format code for better readability and consistency
- Add comprehensive comments for each entity type

Author: kiwicopple

wasm-wrappers/fdw/slack_fdw/src/api.rs

@@ -6,7 +6,7 @@ pub fn apply_conditions_test(
     conditions: &[(String, String, String)], // (column, operator, value)
 ) -> HashMap<String, String> {
     let mut params = HashMap::new();
-    
+
     for (column, operator, value) in conditions {
         match endpoint {
             "conversations.history" => {
@@ -17,15 +17,15 @@ pub fn apply_conditions_test(
                 } else if column == "latest" && operator == "le" {
                     params.insert("latest".to_string(), value.clone());
                 }
-            },
+            }
             "users.list" => {
                 // Users API doesn't support many filters
-            },
+            }
             "conversations.list" => {
                 if column == "types" && operator == "eq" {
                     params.insert("types".to_string(), value.clone());
                 }
-            },
+            }
             "files.list" => {
                 if column == "channel_id" && operator == "eq" {
                     params.insert("channel".to_string(), value.clone());
@@ -36,66 +36,89 @@ pub fn apply_conditions_test(
                 } else if column == "ts_to" && operator == "le" {
                     params.insert("ts_to".to_string(), value.clone());
                 }
-            },
+            }
             _ => {}
         }
     }
-    
+
     params
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
-    
+
     #[test]
     fn test_apply_conditions_conversations_history() {
         let conditions = vec![
-            ("channel_id".to_string(), "eq".to_string(), "C12345".to_string()),
-            ("oldest".to_string(), "ge".to_string(), "1234567890.123456".to_string()),
+            (
+                "channel_id".to_string(),
+                "eq".to_string(),
+                "C12345".to_string(),
+            ),
+            (
+                "oldest".to_string(),
+                "ge".to_string(),
+                "1234567890.123456".to_string(),
+            ),
         ];
-        
+
         let params = apply_conditions_test("conversations.history", &conditions);
-        
+
         assert_eq!(params.get("channel"), Some(&"C12345".to_string()));
         assert_eq!(params.get("oldest"), Some(&"1234567890.123456".to_string()));
     }
-    
+
     #[test]
     fn test_apply_conditions_files_list() {
         let conditions = vec![
-            ("channel_id".to_string(), "eq".to_string(), "C12345".to_string()),
-            ("user_id".to_string(), "eq".to_string(), "U12345".to_string()),
-            ("ts_from".to_string(), "ge".to_string(), "1234567890.123456".to_string()),
+            (
+                "channel_id".to_string(),
+                "eq".to_string(),
+                "C12345".to_string(),
+            ),
+            (
+                "user_id".to_string(),
+                "eq".to_string(),
+                "U12345".to_string(),
+            ),
+            (
+                "ts_from".to_string(),
+                "ge".to_string(),
+                "1234567890.123456".to_string(),
+            ),
         ];
-        
+
         let params = apply_conditions_test("files.list", &conditions);
-        
+
         assert_eq!(params.get("channel"), Some(&"C12345".to_string()));
         assert_eq!(params.get("user"), Some(&"U12345".to_string()));
-        assert_eq!(params.get("ts_from"), Some(&"1234567890.123456".to_string()));
+        assert_eq!(
+            params.get("ts_from"),
+            Some(&"1234567890.123456".to_string())
+        );
     }
-    
+
     #[test]
     fn test_apply_conditions_conversations_list() {
-        let conditions = vec![
-            ("types".to_string(), "eq".to_string(), "public_channel".to_string()),
-        ];
-        
+        let conditions = vec![(
+            "types".to_string(),
+            "eq".to_string(),
+            "public_channel".to_string(),
+        )];
+
         let params = apply_conditions_test("conversations.list", &conditions);
-        
+
         assert_eq!(params.get("types"), Some(&"public_channel".to_string()));
     }
-    
+
     #[test]
     fn test_apply_conditions_unsupported_endpoint() {
-        let conditions = vec![
-            ("test".to_string(), "eq".to_string(), "test".to_string()),
-        ];
-        
+        let conditions = vec![("test".to_string(), "eq".to_string(), "test".to_string())];
+
         let params = apply_conditions_test("unsupported.endpoint", &conditions);
-        
+
         // Should return empty params for unsupported endpoint
         assert!(params.is_empty());
     }
-}
+}