[WIP] Update to Error Handling

[tsurdilo]

Updates to error handling

• need to update examples and comparisons and go over spec doc.*
• need to add sample that shows action error handling.

rendered error handling section https://github.com/tsurdilo/specification/blob/uperrhandling/specification.md#workflow-error-handling

error data schema: in pr and can look and try it out here: https://github.com/tsurdilo/specification/blob/uperrhandling/schema/errordata.json