feat: query utilities and cleanup

[cofin]

Pull Request Checklist

• New code has 100% test coverage
• (If applicable) The prose documentation has been updated to reflect the changes introduced by this PR
• (If applicable) The reference documentation has been updated to reflect the changes introduced by this PR
• Pre-Commit Checks were ran and passed
• Tests were ran and passed

Description

Adds the following:

• Reduce duplication between async / sync repositories
• Added SQLQueryRepository
• Added SQLQueryService to use for raw sql queries that don't map to an declarative base.
• Helpers from examples to load a json fixtures from a file async and sync
• Move to_schema to mixin

Close Issue(s)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.77888% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 90.06%. Comparing base (3201007) to head (d47c272).

Files	Patch %	Lines
advanced_alchemy/repository/_async.py	82.50%	14 Missing ⚠️
advanced_alchemy/repository/_sync.py	82.50%	14 Missing ⚠️
advanced_alchemy/utils/fixtures.py	80.95%	4 Missing ⚠️
advanced_alchemy/repository/_util.py	98.21%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #159      +/-   ##
==========================================
- Coverage   90.70%   90.06%   -0.65%     
==========================================
  Files          49       50       +1     
  Lines        3272     3321      +49     
==========================================
+ Hits         2968     2991      +23     
- Misses        304      330      +26     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
1 Accepted issue

Measures
0 Security Hotspots
81.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Documentation preview will be available shortly at https://litestar-org.github.io/advanced-alchemy-docs-preview/159

[Alc-Alc]

🤌