chore(codegen): bump codegen version to 0.19.0

[hpmellema]

Description

Bump codegen version to 0.19.0

Generated clients have a diff for exporting RuntimeExtension and Client ExtensionConfiguration, e.g. for Access Analyzer:

diff --git a/clients/client-accessanalyzer/src/index.ts b/clients/client-accessanalyzer/src/index.ts
index 50b2e0692a6..74d473da178 100644
--- a/clients/client-accessanalyzer/src/index.ts
+++ b/clients/client-accessanalyzer/src/index.ts
@@ -16,6 +16,8 @@
 export * from "./AccessAnalyzerClient";
 export * from "./AccessAnalyzer";
 export { ClientInputEndpointParameters } from "./endpoint/EndpointParameters";
+export { RuntimeExtension } from "./runtimeExtensions";
+export { AccessAnalyzerExtensionConfiguration } from "./extensionConfiguration";
 export * from "./commands";
 export * from "./pagination";
 export * from "./models";

Also added experimental identity and auth private client package.

Also see: smithy-lang/smithy-typescript#1060

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