fix(client): optional image deployment model param

Author: TomerAberbach

openai-java-core/src/main/kotlin/com/openai/services/async/ImageServiceAsyncImpl.kt

@@ -138,7 +138,11 @@ class ImageServiceAsyncImpl internal constructor(private val clientOptions: Clie
  .addPathSegments("images", "generations")
  .body(json(clientOptions.jsonMapper, params._body()))
  .build()
- .prepareAsync(clientOptions, params, params.model().toString())
+ .prepareAsync(
+ clientOptions,
+ params,
+ deploymentModel = params.model().map { it.toString() }.orElse(null),
+ )
  val requestOptions = requestOptions.applyDefaults(RequestOptions.from(clientOptions))
  return request
  .thenComposeAsync { clientOptions.httpClient.executeAsync(it, requestOptions) }

openai-java-core/src/main/kotlin/com/openai/services/blocking/ImageServiceImpl.kt

@@ -128,7 +128,11 @@ class ImageServiceImpl internal constructor(private val clientOptions: ClientOpt
  .addPathSegments("images", "generations")
  .body(json(clientOptions.jsonMapper, params._body()))
  .build()
- .prepare(clientOptions, params, params.model().toString())
+ .prepare(
+ clientOptions,
+ params,
+ params.model().map { it.toString() }.orElse(null),
+ )
  val requestOptions = requestOptions.applyDefaults(RequestOptions.from(clientOptions))
  val response = clientOptions.httpClient.execute(request, requestOptions)
  return response.parseable {