feat: Streamline SQL INTERVAL handling and improve related error messages, update sqlparser-rs lib

[alexander-beedie]

Double-checking against a PostgreSQL instance confirmed that unary ops are invalid when applied to interval strings (eg: INTERVAL -'7d' instead of INTERVAL '-7d'), so can simplify the parsing and raise a clear error here instead.

Also upgraded sqlparser-rs from 0.39 to 0.45; the very latest release (0.47) will require a bit more work to upgrade to so I'll tackle that later. Still pick up a few good additions/fixes with this jump.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.45%. Comparing base (6f3fd8e) to head (6a1162f).

Files	Patch %	Lines
crates/polars-sql/src/keywords.rs	0.00%	1 Missing ⚠️
crates/polars-sql/src/sql_expr.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16744   +/-   ##
=======================================
  Coverage   81.45%   81.45%           
=======================================
  Files        1413     1413           
  Lines      186306   186297    -9     
  Branches     2777     2777           
=======================================
- Hits       151750   151746    -4     
+ Misses      34036    34031    -5     
  Partials      520      520           

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[codspeed-hq]

CodSpeed Performance Report

Merging #16744 will degrade performances by 15.15%

_{Comparing alexander-beedie:update-sqlparser (6a1162f) with main (6f3fd8e)}

Summary

❌ 1 regressions
✅ 36 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	alexander-beedie:update-sqlparser	Change
❌	test_tpch_q14	2.1 ms	2.5 ms	-15.15%