Add graphql interface for PartitionSets

Summary: This diff adds two new query fields: `partitionSetOrError` and `partitionSetsOrError`.

Test Plan: unit

Reviewers: prha

Differential Revision: https://dagster.phacility.com/D1646

Add grqphal interface for PartitionSets

Summary: This diff adds two new query fields: `partitionSetOrError` and `partitionSetsOrError`.

Test Plan: unit

Reviewers: prha

Subscribers:

got rid of unnused import

added factory wrappers and addressed feedback

[composites] enforce io mapping types match

Summary:
There are currently some very nasty bugs when types do not match on both sides of a mapping. For example during input hydration we use the outer composite type at schema validation time but the inner type during the actual hydration which is an awfully confusing error.

There are maybe some valid uses of mismatched types - but they can always be solved by a "cast" solid which fixes the type disparity.

Test Plan: existing tests

Reviewers: schrockn, max

Differential Revision: https://dagster.phacility.com/D1640

[composites] enforce io mapping types match

Summary:
There are currently some very nasty bugs when types do not match on both sides of a mapping. For example during input hydration we use the outer composite type at schema validation time but the inner type during the actual hydration which is an awfully confusing error.

There are maybe some valid uses of mismatched types - but they can always be solved by a "cast" solid which fixes the type disparity.

Test Plan: existing tests

Reviewers: schrockn, max

Differential Revision: https://dagster.phacility.com/D1640

Add support for GCS custom prefix

Summary: just keeping GCS intermediates support in sync w/ S3 - this replicates the behavior of dagster-io#1981

Test Plan: unit

Differential Revision: https://dagster.phacility.com/D1645

Add support for GCS custom prefix

Summary: just keeping GCS intermediates support in sync w/ S3 - this replicates the behavior of dagster-io#1981

Test Plan: unit

Reviewers:

Subscribers:

[dagster-graphql] remove stack from error interface

Summary: Most only `PythonError` actually provides it, this can result in server errors when you query it on other Error implementors. Wish graphene would prevent this kind of ish.

Test Plan: bk

Reviewers: schrockn, max, prha

Differential Revision: https://dagster.phacility.com/D1644

[dagster-graphql] remove stack from error interface

Summary: Most only `PythonError` actually provides it, this can result in server errors when you query it on other Error implementors. Wish graphene would prevent this kind of ish.

Test Plan: bk

Reviewers: schrockn, max, prha

Subscribers: