Support custom Queryer type

[winebarrel]

No description provided.

[Copilot]

Pull request overview

This PR adds support for customizing the Queryer type name in generated code. Previously, the generated methods always used a hardcoded "Queryer" type for database parameters. Now users can specify a custom type name via the --queryer flag, allowing integration with custom database interface types.

Changes:

• Added --queryer command-line flag to specify custom Queryer type name
• Modified templates and code generation to use the custom Queryer type instead of hardcoded "Queryer"
• Updated all test cases to pass the new queryer parameter with empty string (defaulting to "Queryer")
• Added new test case to verify custom Queryer type generation

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
main.go	Added --queryer flag and passed it to PgCreateStruct function
dgw.go	Added Queryer field to Struct type and updated PgTableToStruct and PgCreateStruct to accept and use custom queryer parameter
template/method.tmpl	Updated all method signatures to use {{ .Struct.Queryer }} instead of hardcoded "Queryer"
dgw_test.go	Updated all test function calls to pass empty string for queryer parameter, and added comprehensive test for custom Queryer functionality
README.md	Added documentation for the new --queryer flag

Comments suppressed due to low confidence (1)

main.go:52

• When a custom queryer type name is specified via the --queryer flag, the code still appends the hardcoded Queryer interface definition from queryInterface constant. This creates a mismatch where generated methods reference a custom type (e.g., MyQueryer) but the appended interface is still named Queryer. Consider either: (1) not appending the interface when a custom queryer is specified, (2) dynamically generating the interface with the custom name, or (3) documenting that users must define their own interface when using a custom queryer name.

		q := []byte(queryInterface)
		src = append(st, q...)

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