Add more informational Display for Static types

[jpschorr]

Currently used in another project to output types like:

AnyOf(NOT NULL String, Int8, String, DateTime, String, Bool, String, AnyOf({value: Decimal(7,4), currency: String}, Decimal(3,2), Decimal(3,2), Decimal(4,2), Decimal(5,2)), {test_decimal: Decimal(3,0), test_string: String}, {nested_struct: {nested_struct: {nested_struct: {nested_struct: {nested_struct: {test_int: Int8}}}}}}),

---

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

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 20 lines in your changes missing coverage. Please review.

Project coverage is 80.57%. Comparing base (843d3ee) to head (390ff2c).
Report is 1 commits behind head on main.

Files	Patch %	Lines
partiql-types/src/lib.rs	60.00%	17 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
- Coverage   80.61%   80.57%   -0.04%     
==========================================
  Files          70       70              
  Lines       18997    19025      +28     
  Branches    18997    19025      +28     
==========================================
+ Hits        15315    15330      +15     
- Misses       3238     3248      +10     
- Partials      444      447       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Conformance comparison report

	Base (843d3ee)	36533c5	+/-
% Passing	90.35%	90.35%	0.00%
✅ Passing	5731	5731	0
❌ Failing	612	612	0
🔶 Ignored	0	0	0
Total Tests	6343	6343	0

Number passing in both: 5731

Number failing in both: 612

Number passing in Base (843d3ee) but now fail: 0

Number failing in Base (843d3ee) but now pass: 0