1.1.0

PostgreSQL dialect with ILIKE and RETURNING support

• Add PostgreSqlDialect extending AbstractSqlDialect:
  double-quote identifier quoting, supportsReturning()=true,
  appendConditionFragment override for ILIKE/NOT ILIKE
• Register SqlDialect.POSTGRESQL constant in SqlDialect interface
• Add ILIKE and NOT_ILIKE to Operator enum (PostgreSQL-only operators)
• Add supportsReturning() hook to AbstractSqlDialect;
  renderDelete() now appends RETURNING clause when the hook returns true

RETURNING clause support to DML builders

• Add returningColumns field + getter/setter to Query
• DeleteBuilder.returning(String... columns): passed through Query
  to AbstractSqlDialect.renderDelete() via supportsReturning() hook
• InsertBuilder.returning(String... columns): appended inline to SQL
• UpdateBuilder.returning(String... columns): appended inline to SQL

whereILike / orWhereILike builder methods

• QueryBuilder.whereILike(column, value): ILIKE condition with AND connector
• QueryBuilder.orWhereILike(column, value): ILIKE condition with OR connector
• SelectBuilder.whereILike(column, value): ILIKE condition with AND connector
  (follows existing whereLike pattern; no orWhere* in SelectBuilder)

ColumnType for type-safe column definitions

• Add ColumnType final class with 25 fixed-type constants (TINYINT through
  UUID), 7 parameterised factory methods (varChar, charType, decimal,
  numeric, binary, varBinary, timestamp), and 4 chainable modifier methods
  (notNull, unique, autoIncrement, defaultValue)
• Add CreateBuilder.column(String, ColumnType) overload; delegates to the
  existing column(String, String) via ColumnType.toSql(), fully backward
  compatible
• Add ColumnTypeTest: 32 tests covering constants, factories, modifiers,
  chaining, and CreateBuilder integration

Per-type shorthand classes

Each class in the new col package wraps a single ColumnType constant or
factory method behind a concise name and a uniform of() / of(params)
factory. Developers can use a wildcard import to write:

import com.github.ezframework.javaquerybuilder.query.builder.col.*;

.column("id",         Int.of().notNull().autoIncrement())
.column("username",   VarChar.of(64).notNull().unique())
.column("price",      Decimal.of(10, 2))
.column("created_at", Timestamp.of())

instead of prefixing every type with ColumnType.

Classes added (31 total):
Fixed types: TinyInt, SmallInt, Int, BigInt, SqlFloat, SqlDouble,
Real, Bool, Text, TinyText, MediumText, LongText, Clob,
Blob, TinyBlob, MediumBlob, LongBlob, Date, Time, DateTime,
Json, Serial, BigSerial, Uuid
Parameterised types: Timestamp (overloaded of() / of(int)),
VarChar, Char, Decimal, Numeric, Binary, VarBinary

• SqlFloat / SqlDouble / Bool named to avoid shadowing java.lang types
  when the package is wildcard-imported
• ColTypesTest: 34 tests covering all classes and modifier chaining