feat: drop objects

[leiysky]

No description provided.

[Copilot]

Pull request overview

Adds SQL builders for DROP INDEX, DROP TABLE, and DROP SCHEMA, including support for IF EXISTS and drop behavior (CASCADE / RESTRICT), plus snapshot tests to validate generated SQL.

Changes:

• Introduce DropBehavior enum to represent CASCADE / RESTRICT.
• Add new statement builders: DropIndex, DropTable, DropSchema.
• Add insta snapshot tests covering the generated DROP SQL.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pqb/tests/drop.rs	Adds snapshot tests validating DROP SQL generation.
pqb/src/types/mod.rs	Introduces DropBehavior shared by DROP statement builders.
pqb/src/table/mod.rs	Wires in the new table::drop module and re-exports it.
pqb/src/table/drop.rs	Implements DropTable builder and SQL writer.
pqb/src/schema/mod.rs	Introduces new schema module with drop support.
pqb/src/schema/drop.rs	Implements DropSchema builder and SQL writer.
pqb/src/lib.rs	Exposes the new schema module from the crate root.
pqb/src/index/mod.rs	Wires in the new index::drop module and re-exports it.
pqb/src/index/drop.rs	Implements DropIndex builder and SQL writer.

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