Be able to access resources by string index

[dpeng817]

Use Case

If constructing solids programmatically in a way that is parameterized by resource key, then it's more convenient to access resources by string.

def create_a_solid(my_resource_key: str, my_resource_def: ResourceDefinition) -> SolidDefinition:
    @solid(required_resource_keys={my_resource_key})
    def _inner_solid(context):
        return context.resources[my_resource_key] # This is cleaner
        return context.resources.__getattribute__(my_resource_key) # Not very elegant, also not documented anywhere.

    return _inner_solid

Ideas of Implementation

This implementation could be added relatively straightforwardly to our custom resources object.

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[ahoneycutt]

I currently employ my_resource = getattr(context.resources, my_resource_key) and think this proposed implementation would clean things up a bit.

[yuhan]

I believe we use getattr throughout the system but I do agreed the proposed api is cleaner -- marking this as backlog for now