Pg range types

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[Copilot]

Pull request overview

Adds first-class PostgreSQL range/multirange support to the type system and SQLx integration so queries involving range constructors, operators, and functions can be typed and (for supported element types) mapped to sqlx::postgres::types::PgRange.

Changes:

• Extend qusql-type’s Type model + unification logic to represent and match Range(Box<Type>) and MultiRange(Box<Type>).
• Implement typing for PostgreSQL range/multirange constructors, key operators, and several range-related functions (plus unnest(anymultirange) overload).
• Add SQLx-side PgRange<T> bindings and tests for decoding/binding daterange, int4range, and multirange workflows.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
qusql-type/src/typer.rs	Adds recursive type matching for Range/MultiRange.
qusql-type/src/type_reference.rs	Extends table-function UNNEST typing to support multirange → range columns.
qusql-type/src/type_insert_replace.rs	Tweaks insert/replace missing-column error formatting.
qusql-type/src/type_function.rs	Adds typing for range/multirange constructors and functions; updates lower/upper/unnest overload behavior.
qusql-type/src/type_expression.rs	Treats MultiRange as non-numeric for unary numeric operators.
qusql-type/src/type_binary_expression.rs	Adds range/multirange handling for <</>> and certain user-defined operators.
qusql-type/src/type_.rs	Refactors Type::Range to carry an element Type and introduces Type::MultiRange.
qusql-type/src/schema.rs	Preserves int4 vs int8 element width when mapping parsed range subtypes into Type.
qusql-type/src/lib.rs	Adds regression tests covering parsing/typing of range + multirange operators/functions.
qusql-sqlx-type/src/lib.rs	Adds PgRange<T> argument/row bindings behind a postgres feature; re-exports PgRange.
qusql-sqlx-type/Cargo.toml	Adds postgres feature and enables sqlx postgres support for dev-tests.
qusql-sqlx-type-test/src/test.rs	Adds integration tests for daterange, int4range, and an int8multirange update + unnest() workflow.
qusql-sqlx-type-test/sqlx-type-schema.sql	Extends test schema with daterange and int8multirange tables/columns.
qusql-sqlx-type-test/Cargo.toml	Enables postgres/uuid support and adds chrono/uuid deps for new tests.
qusql-sqlx-type-macro/src/lib.rs	Maps supported PostgreSQL range element types to qusql_sqlx_type::PgRange<...> in generated code.
qusql-py-mysql-type-plugin/src/lib.rs	Treats MultiRange as Any for MySQL Python type plugin mapping.
qusql-parse/src/keywords.rs	Adds PostgreSQL range-function keywords (isempty, lower_inc, etc.).
qusql-parse/src/function_expression.rs	Parses new PostgreSQL range/multirange functions into dedicated Function variants.
qusql-mysql-type-macro/src/lib.rs	Adds MultiRange placeholder handling (still todo!()) in MySQL macro mapping.

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