feat(users): Add preferred_merchant_id column and update user details API (#3373)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/api_models/src/user.rs

@@ -147,3 +147,9 @@ pub struct VerifyTokenResponse {
     pub merchant_id: String,
     pub user_email: pii::Email,
 }
+
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+pub struct UpdateUserAccountDetailsRequest {
+    pub name: Option<Secret<String>>,
+    pub preferred_merchant_id: Option<String>,
+}