Greengrass Client V2

[MikeDombo]

Issue #, if available:

Description of changes:

• Client can automatically create a proper client (no more IPCUtils needed) and use custom options as needed.
• The V2 client differentiates between APIs which require a streaming response and those that do not. Those that don't, do not have a parameter to register a callback.
• We now generate both sync and async overloads for all calls. The sync version will block on the future and throw any service errors.
• Client has overloads with the old StreamHandler object as well as options for providing a simple callback for stream events, errors, and closing. Optionally (default is true), an executor will be used to run the stream event callback when the callback is provided as a callback. This prevents users from accidentally blocking the event loop.
• I've updated the data model setters to return this so that we can now chain calls.
• Streaming APIs return the handler so that the user can close the stream

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.