refactor: rename `*Interface` types to idiomatic Go names in `field` package

[pageton]

Summary

Several types in field/interface.go use an *Interface suffix that doesn't follow Go naming conventions. Go interfaces are named after the behavior they describe (e.g. io.Reader, io.Closer), not with an Interface suffix.

Current

type QueryInterface = clause.Expression
type AssociationInterface interface { ... }
type ColumnInterface interface { ... }
type OrderableInterface interface { ... }
type DistinctInterface interface { ... }

Proposed

Current	Proposed	Notes
QueryInterface	Query	Type alias — rename to Query or remove and use clause.Expression directly
AssociationInterface	Association	Free name, no clash
ColumnInterface	Column	Free name, no clash
OrderableInterface	Orderable	Free name, no clash
DistinctInterface	Remove	Duplicate of Selectable (same method: buildSelectArg() any)

Affected Files

• field/interface.go — type definitions
• All files referencing the renamed types

References

• Effective Go — Interfaces
• Go Code Review Comments — Interface names