fix(parse): honor custom style lifts

[quinnj]

Summary

• normalize custom style lift return values so plain values work as expected
• call custom lazy object/array lifts before default materialization
• add regression tests for custom Date parse styles from issue Multiple Styles for same Struct not working #434

Testing

• julia --project=. -e 'using Pkg; Pkg.test(; coverage=false)'

Fixes #434

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.32%. Comparing base (9310c58) to head (2ec7145).

Files with missing lines	Patch %	Lines
src/parse.jl	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
+ Coverage   90.20%   90.32%   +0.11%     
==========================================
  Files           7        7              
  Lines        1399     1416      +17     
==========================================
+ Hits         1262     1279      +17     
  Misses        137      137              

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