[New Generator] Rust API client generator (#6092)

* Added rust client example

* Added a proper apiclient / configuration based example

samples/client/petstore/rust/src/models/category.rs

@@ -0,0 +1,8 @@
+/// Pet catehgry
+///
+/// A category for a pet
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Category {
+    id: Option<i64>,
+    name: Option<String>,
+}

samples/client/petstore/rust/src/models/mod.rs

@@ -0,0 +1,8 @@
+mod pet;
+pub use self::pet::Pet;
+
+mod category;
+pub use self::category::Category;
+
+mod tag;
+pub use self::tag::Tag;

samples/client/petstore/rust/src/models/pet.rs

@@ -0,0 +1,34 @@
+/// a Pet
+///
+/// A pet for sale in the pet store
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Pet {
+    id: Option<i64>,
+    category: Option<super::Category>,
+    name: String,
+    #[serde(rename = "photoUrls")] photo_urls: Vec<String>,
+    tags: Vec<super::Tag>,
+    status: Option<String>,
+}
+
+impl Pet {
+  pub fn new(name: String, photo_urls: Vec<String>) -> Pet {
+    Pet {
+      id: None,
+      category: None,
+      name: name,
+      photo_urls: photo_urls,
+      tags: Vec::new(),
+      status: None,
+    }
+  }
+
+  pub fn set_id(&mut self, id: i64) {
+    self.id = Some(id);
+  }
+
+  pub fn with_id(mut self, id: i64) -> Pet {
+    self.id = Some(id);
+    self
+  }
+}

samples/client/petstore/rust/src/models/tag.rs

@@ -0,0 +1,8 @@
+/// Pet Tag
+///
+/// A tag for a pet
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Tag {
+    id: Option<i64>,
+    name: Option<String>,
+}