refactor: Split go file by struct

[winebarrel]

No description provided.

[Copilot]

Pull request overview

This PR refactors the codebase by splitting two monolithic files into multiple smaller files organized by struct and interface type, improving code organization and maintainability without changing any functionality.

Changes:

• Split types.go into 6 separate files (db.go, tx.go, stmt.go, exec_queryer.go, execer.go, queryer.go)
• Split iface/iface.go into 6 separate files with corresponding interface definitions
• All code logic remains identical; only file organization has changed

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
types.go	Removed monolithic file containing all struct definitions
db.go	Added file containing DB struct and its methods
tx.go	Added file containing Tx struct and its methods
stmt.go	Added file containing Stmt struct definition
exec_queryer.go	Added file containing ExecQueryer struct and its methods
execer.go	Added file containing Execer struct and its methods
queryer.go	Added file containing Queryer struct and its methods
iface/iface.go	Removed monolithic file containing all interface definitions
iface/db.go	Added file containing DB interface definition
iface/tx.go	Added file containing Tx interface definition
iface/stmt.go	Added file containing Stmt interface definition
iface/exec_queryer.go	Added file containing ExecQueryer interface definition
iface/execer.go	Added file containing Execer interface definition
iface/queryer.go	Added file containing Queryer interface definition

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