feat: add dialect and planetscale connector

[Gerbuuun]

🔗 Linked issue

#32

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I have added a connector for @planetscale/database.
It is mostly a copy of the Postgresql connector with some small changes.

Due to differences in SQL dialects I added a dialect option to the testConnector function.
Using a switch statement, the correct query is used for the different dialects.
Maybe there are better other options (suggestions)?

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Attention: Patch coverage is 32.20339% with 40 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@f473e6b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/connectors/planetscale.ts	24.00%	38 Missing ⚠️
src/connectors/bun-sqlite.ts	0.00%	1 Missing ⚠️
src/connectors/cloudflare-d1.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #59   +/-   ##
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  Coverage        ?   42.68%           
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  Files           ?       16           
  Lines           ?      574           
  Branches        ?       51           
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  Hits            ?      245           
  Misses          ?      324           
  Partials        ?        5           

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[pi0]

Thanks ❤️