Expose root workflow execution

[cretz]

Describe the solution you'd like

temporalio/api#366 made root workflow execution available on both workflow start and workflow execution info. SDKs should do the following:

• Expose root workflow execution workflow ID and run ID from workflow info in a similar fashion to how is done with parent execution
• Expose root workflow execution workflow ID and run ID from workflow execution (e.g. what comes back from list and describe) in a similar fashion to how is done with parent execution

Per-SDK Tickets

• Go - Expose root workflow execution sdk-go#1848
• Java - Expose root workflow execution sdk-java#2430
• Core - [Feature Request] Expose root workflow execution sdk-core#881
• TypeScript - [Feature Request] Expose root workflow execution sdk-typescript#1633
• Python - [Feature Request] Expose root workflow execution sdk-python#774
• .NET - [Feature Request] Expose root workflow execution sdk-dotnet#415
• Ruby - [Feature Request] Expose root workflow execution sdk-ruby#227
• PHP - [Feature Request] Expose root workflow execution sdk-php#576
• Temporal CLI - [Feature Request] Expose root workflow execution cli#763

[Sushisource]

FYI the API is missing the root workflow's namespace which may be different. All docstrings should have a comment to that effect (the Core one can be used an an example)