Add fields of struct array support to dataframe creation functions

[gavinkflam]

See #333

• Extend array-type to support any Spark SQL DataType, in the same fashion we are already doing in struct-field.
• Improve create-dataframe tests, adding tests for struct fields and struct array fields

[anthony-khong]

Looks good to me! Thank you for the PR! I'll merge all the checks pass!

[codecov-commenter]

Codecov Report

Merging #334 (9f0132a) into develop (52b3e99) will increase coverage by 0.000%. The diff coverage is 100.000%.

@@            Coverage Diff            @@
##           develop      #334   +/-   ##
=========================================
  Coverage   99.967%   99.967%           
=========================================
  Files           36        36           
  Lines         3084      3085    +1     
=========================================
+ Hits          3083      3084    +1     
  Misses           1         1           

Impacted Files	Coverage Δ
...rc/clojure/zero_one/geni/core/dataset_creation.clj	100.000% <100.000%> (ø)