feat: add pglite option to pgstrap.config.js

[kmxunan]

/claim #2

Summary

• Added option to interface
• now reads from config by default (no need for flag)
• CLI flag still works as override
• Added documentation in README

Usage

// pgstrap.config.js
export default {
  defaultDatabase: "mydb",
  schemas: ["public"],
  pglite: true,
}

Now pgstrap generate uses PGlite automatically without requiring --pglite.

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[kmxunan]

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