Handle tuples in build_function.jl

[5hv5hvnk]

Solves #1438
Added a work around to treat tuples as array and then return a tuple by converting it to a list.

ToDo:

• Add tests

[ChrisRackauckas]

This would allocate though?

[5hv5hvnk]

I think so, I can probably write some tests to verify?
I tried it on the example in issue and it was working, not sure if it will generalize.

[ChrisRackauckas]

Yes write some tests that check if the tuple route is non-allocating on simple functions. I don't think it would pass.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 7.70%. Comparing base (eced900) to head (b1f2e5d).
Report is 164 commits behind head on master.

Files with missing lines	Patch %	Lines
src/build_function.jl	0.00%	29 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##           master   #1462      +/-   ##
=========================================
- Coverage    8.88%   7.70%   -1.18%     
=========================================
  Files          51      51              
  Lines        4876    4943      +67     
=========================================
- Hits          433     381      -52     
- Misses       4443    4562     +119     

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[ChrisRackauckas]

@AayushSabharwal how do this come into your changes to function building?