[Rust Client] several small fixes to code generation errors (#8845)

* fix cyclic types

* fixed up bad enum names

* fixed double crate:: issue

* add required ToString for enum classes

* Adds Debug/Clone derive macro for generated configuration type

* Updates versions of dependencies recorded in generated Cargo.toml

* fix merge

* bin/generate-samples.sh

Co-authored-by: Benjamin Naecker <bnaecker@fastmail.com>

samples/client/petstore/rust/reqwest/petstore-async/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 serde = "^1.0"
 serde_derive = "^1.0"
 serde_json = "^1.0"
-url = "1.5"
+url = "^2.2"
 [dependencies.reqwest]
 version = "^0.11"
 default-features = false

samples/client/petstore/rust/reqwest/petstore-async/src/apis/configuration.rs

@@ -11,6 +11,7 @@
 
 use reqwest;
 
+#[derive(Debug, Clone)]
 pub struct Configuration {
     pub base_path: String,
     pub user_agent: Option<String>,
@@ -24,6 +25,7 @@ pub struct Configuration {
 
 pub type BasicAuth = (String, Option<String>);
 
+#[derive(Debug, Clone)]
 pub struct ApiKey {
     pub prefix: Option<String>,
     pub key: String,

samples/client/petstore/rust/reqwest/petstore-async/src/models/pet.rs

@@ -17,7 +17,7 @@ pub struct Pet {
     #[serde(rename = "id", skip_serializing_if = "Option::is_none")]
     pub id: Option<i64>,
     #[serde(rename = "category", skip_serializing_if = "Option::is_none")]
-    pub category: Option<crate::models::Category>,
+    pub category: Option<Box<crate::models::Category>>,
     #[serde(rename = "name")]
     pub name: String,
     #[serde(rename = "photoUrls")]