Support more conditionally top level tokens

[lu-zero]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.64706% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.24%. Comparing base (227688f) to head (de2b2b7).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/tokenizer.rs	97.10%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
- Coverage   99.28%   99.24%   -0.05%     
==========================================
  Files           6        6              
  Lines        3489     3558      +69     
  Branches     3489     3558      +69     
==========================================
+ Hits         3464     3531      +67     
- Misses         18       19       +1     
- Partials        7        8       +1     

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[Copilot]

Pull Request Overview

This PR adds support for more conditionally top level tokens by introducing a new alias field to the Token struct and updating the tokenizer to handle more SQL keywords and statements properly. The changes improve SQL formatting by better recognizing and handling contextual keywords like USING, MERGE INTO, and CREATE TABLE variants.

• Adds an alias field to Token struct for grouping token behavior variants
• Extends keyword recognition for CREATE TABLE, MERGE INTO, USING, and other SQL constructs
• Updates token creation logic to handle conditional top-level token behavior
• Adds test case for DELETE FROM...USING queries

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/tokenizer.rs	Adds alias field to Token struct, extends keyword parsing for CREATE/MERGE/USING statements, updates all token creation sites
src/lib.rs	Adds test case for DELETE FROM...USING query formatting
src/formatter.rs	Updates top-level token formatting logic to handle CREATE tokens specially

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