[kotlin-client][jvm-spring-*] Fixed URL encoding (#17493)

* [kotlin-client][jvm-spring-*] do URL encoding via the UrlBuilder instead of manual replacement

* [kotlin-client][jvm-spring-*] Fixed imports

* ensure up-to-date

* Fixed syntax problem

* Removed unnecessary toString()

samples/client/petstore/kotlin-array-simple-string-multiplatform/src/commonMain/kotlin/org/openapitools/client/infrastructure/RequestConfig.kt

@@ -12,6 +12,7 @@ data class RequestConfig<T>(
     val method: RequestMethod,
     val path: String,
     val headers: MutableMap<String, String> = mutableMapOf(),
+    val params: MutableMap<String, Any> = mutableMapOf(),
     val query: MutableMap<String, List<String>> = mutableMapOf(),
     val requiresAuthentication: Boolean,
     val body: T? = null