Supporting recursive expansion of typeDSL

[tom-tan]

Since Schema Salad v1.3 (which will likely be used in CWL v1.3), supporting TypeDSL fields with syntax such as File[][] is required.
It would be nice if CWLDotNet can support it by updating

• https://github.com/common-workflow-language/schema_salad/blob/816602bea2511995141235eef34dac80b200857b/schema_salad/dotnet/util/Loaders/TypeDSLLoader.cs#L11
• https://github.com/common-workflow-language/schema_salad/blob/816602bea2511995141235eef34dac80b200857b/schema_salad/dotnet_codegen.py#L839
• then regenerating the CWLDotNet parsers in this repo

See common-workflow-language/schema_salad#711 for how this was done for Python

• https://github.com/common-workflow-language/schema_salad/pull/711/files#diff-e6741ecbdc425147484392318bfa8d1424ab8506496b13a2bfa67aa5b94254bdR634
• https://github.com/common-workflow-language/schema_salad/pull/711/files#diff-9b3bfeab727fa5c3302c6eda143a8379c03d1e89e8fa7011186c6154aa6ed3e1R585

Related:

• Proposed CWL v1.3 spec change: Supporting recursive expansion of typeDSL explicitly common-workflow-language/cwl-v1.3#10
• Schema salad and Python codegen: Support nested typeDSL common-workflow-language/schema_salad#711