Get nested field for struct column

[cchantep]

No description provided.

[cchantep]

@imarios review welcome

[pomadchin]

🚀 Looks like a pretty reasonable addition to me, nice!

[codecov]

Codecov Report

Merging #545 (bcd6432) into master (45d7a60) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #545   +/-   ##
=======================================
  Coverage   96.28%   96.28%           
=======================================
  Files          61       61           
  Lines        1050     1051    +1     
  Branches        7        5    -2     
=======================================
+ Hits         1011     1012    +1     
  Misses         39       39           

Flag	Coverage Δ
2.12.14	96.28% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...taset/src/main/scala/frameless/RecordEncoder.scala	100.00% <ø> (ø)
dataset/src/main/scala/frameless/TypedColumn.scala	100.00% <100.00%> (ø)

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