allow for named custom array types

[mr-c]

Necessary for cwltool to be able to parse and run

https://github.com/rabix/sbpack/blob/ebd5fbca8c6aec03015228f3e35ab37f0e208c33/tests/remote-cwl/wf1.cwl

which includes

https://github.com/rabix/sbpack/blob/ebd5fbca8c6aec03015228f3e35ab37f0e208c33/tests/types/testtypes.yml#L1-L4

- name: my_boolean_array
  type: array
  items: boolean
  label: "A boolean array"

• tests, but it is unclear how to do so without running cwltool

[mr-c]

Checking that json_data["name"] is not None nor that it is an empty string is a requirement, as otherwise the metaschema fails to load (for some reason the ArraySchemas there try to load with empty name strings).

[codecov]

Codecov Report

Attention: Patch coverage is 29.62963% with 19 lines in your changes missing coverage. Please review.

Project coverage is 83.01%. Comparing base (f13d30e) to head (041961e).

Files with missing lines	Patch %	Lines
schema_salad/avro/schema.py	20.83%	18 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #919      +/-   ##
==========================================
- Coverage   83.30%   83.01%   -0.29%     
==========================================
  Files          22       22              
  Lines        4948     4970      +22     
  Branches     1185     1189       +4     
==========================================
+ Hits         4122     4126       +4     
- Misses        548      565      +17     
- Partials      278      279       +1     

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