Adds literal STRUCT test

[johnedquinn]

Relevant Issues

• None

Description

• Adds literal STRUCT test just so we don't accidentally break anything in future.

Other Information

• Updated Unreleased Section in CHANGELOG: NO

• Any backward-incompatible changes? [YES/NO]

  • No, just adding a test.

• Any new external dependencies? NO

• Do your changes comply with the Contributing Guidelines
  and Code Style Guidelines? YES

License Information

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

Conformance comparison report

	Base (5617ef6)	b2b763c	+/-
% Passing	92.54%	92.54%	0.00%
✅ Passing	5384	5384	0
❌ Failing	434	434	0
🔶 Ignored	0	0	0
Total Tests	5818	5818	0

Number passing in both: 5384

Number failing in both: 434

Number passing in Base (5617ef6) but now fail: 0

Number failing in Base (5617ef6) but now pass: 0

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (partiql-eval@dccab37). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff               @@
##             partiql-eval    #1299   +/-   ##
===============================================
  Coverage                ?   49.28%           
  Complexity              ?     1046           
===============================================
  Files                   ?      166           
  Lines                   ?    13392           
  Branches                ?     2500           
===============================================
  Hits                    ?     6600           
  Misses                  ?     6135           
  Partials                ?      657           

Flag	Coverage Δ
CLI	11.87% <0.00%> (?)
EXAMPLES	80.28% <0.00%> (?)
LANG	54.72% <0.00%> (?)

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[rchowell]

Holding off on this until removing sequences in values