[Workflow] Rename start to scheduleNew for parity between SDKs

[WhitWaldo]

Describe the proposal

The .NET SDK uses scheduleNewWorkflowAsync to start a new workflow. For the sake of consistent documentation and to lessen developer confusion, I propose renaming this method to scheduleNew to keep the format of the other methods in the JS SDK, but also align its purpose with the other language SDKs.

[WhitWaldo]

As pat of this effort, I'm renaming nearly all the methods on the workflow client to resolve discrepancies between it and the .NET SDK as well. This should add clarity as to the purpose of each method.