(more-config-work-5) Allow bare dict in lieu of Field(Dict(...))
Summary:
Proposed change to implement #1908
Wanted to dicuss before doing work of adding full test coverage
https://github.com/dagster-io/dagster/issues/1908
Depends on D1622
Test Plan: BK
Reviewers: alangenfeld, max, sashank, themissinghlink
Reviewed By: alangenfeld
Differential Revision: https://dagster.phacility.com/D1614