feat: impl callback query/2

[joeljuca]

Closes #28

[joeljuca]

@greptileai pls review this for me

[greptile-apps]

PR Summary

Implements a new query/2 function that provides a flexible way to construct complex Ecto queries by accepting a query modification function, eliminating the need for numerous specific query functions.

• Added query/2 implementation in lib/swiss_schema.ex that wraps results in {:ok, result} tuples and handles errors
• Test cases in test/swiss_schema_test.exs verify function accepts custom query functions
• Support for alternate Ecto repositories through options parameter
• Function accepts a query transformer of type (Ecto.Query.t() -> Ecto.Query.t()) for query customization
• Solves issue #28 by avoiding the need for parameter-specific query handling functions

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[joeljuca]

@greptileai hey – pls review this one again

[greptile-apps]

PR Summary

Added query!/2 function as a non-error-tuple variant of query/2, providing a more direct way to execute Ecto queries with custom transformations.

• Added bang variant query!/2 in lib/swiss_schema.ex that returns results directly or raises on error
• Expanded test coverage in test/swiss_schema_test.exs to include error cases and exception handling
• Consistent error handling for both Ecto.Query and Repo.all errors

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