Add PermissiveDict type to permit config with unknown parameters

[natekupp]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 101740

• 20 of 20 (100.0%) changed or added relevant lines in 4 files are covered.
• 137 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.2%) to 84.845%

---

Files with Coverage Reduction	New Missed Lines	%
python_modules/dagster/dagster/core/execution_context.py	3	97.66%
python_modules/dagster/dagster/core/user_context.py	8	74.19%
python_modules/dagit/dagit/pipeline_execution_manager.py	10	91.2%
python_modules/airline-demo/airline_demo/solids.py	10	90.74%
python_modules/dagster/dagster/core/object_store.py	13	88.59%
python_modules/dagster/dagster/core/types/marshal.py	16	47.37%
python_modules/dagit/dagit/schema/model.py	20	83.24%
python_modules/dagster/dagster/core/execution.py	22	90.45%
python_modules/dagit/dagit/pipeline_run_storage.py	35	75.34%

Totals
Change from base Build 101162:	-0.2%
Covered Lines:	7698
Relevant Lines:	9073

---

💛 - Coveralls

[schrockn]

per discussion on slack use "Permissive" verbiage to describe what is happening here and then add test cases.

This will also have to be exposed to the graphql interface, and then the config editor will have to be changed.

[schrockn]

cool. can you make sure to add a task to support this in the config editor?