936 Handle setup of nested arrays containing BigInt

[dantownsend]

Resolves #936

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 91.97%. Comparing base (4f66bd8) to head (bff45ec).

Files	Patch %	Lines
piccolo/engine/sqlite.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #937   +/-   ##
=======================================
  Coverage   91.97%   91.97%           
=======================================
  Files         108      108           
  Lines        8209     8213    +4     
=======================================
+ Hits         7550     7554    +4     
  Misses        659      659           

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