feat(bun): generate native Go array slices for PostgreSQL array columns

Bun's pgdialect scans/appends native slices directly, so array columns
(text[], integer[], uuid[], ...) always generate as plain []string,
[]int32, etc. with an explicit "array" bun tag, regardless of --types
(sqltypes/stdlib/baselib). The SqlXxxArray wrapper types are no longer
used for Bun array columns (gorm is unaffected and keeps using them).

Adds --array-nullable pointer_slice to represent nullable array columns
as *[]T instead of []T, so callers can distinguish SQL NULL (nil) from
'{}' (pointer to an empty slice). Verified end-to-end against a live
PostgreSQL instance for NULL/{}/populated arrays in every --types mode.

Closes #13

vendor/github.com/uptrace/bun/migrate/sqlschema/table.go

@@ -0,0 +1,56 @@
+package sqlschema
+
+type Table interface {
+	GetSchema() string
+	GetName() string
+	GetColumns() []Column
+	GetPrimaryKey() *PrimaryKey
+	GetUniqueConstraints() []Unique
+}
+
+var _ Table = (*BaseTable)(nil)
+
+// BaseTable is a base table definition.
+//
+// Dialects and only dialects can use it to implement the Table interface.
+// Other packages must use the Table interface.
+type BaseTable struct {
+	Schema string
+	Name   string
+
+	// ColumnDefinitions map each column name to the column definition.
+	Columns []Column
+
+	// PrimaryKey holds the primary key definition.
+	// A nil value means that no primary key is defined for the table.
+	PrimaryKey *PrimaryKey
+
+	// UniqueConstraints defined on the table.
+	UniqueConstraints []Unique
+}
+
+// PrimaryKey represents a primary key constraint defined on 1 or more columns.
+type PrimaryKey struct {
+	Name    string
+	Columns Columns
+}
+
+func (td *BaseTable) GetSchema() string {
+	return td.Schema
+}
+
+func (td *BaseTable) GetName() string {
+	return td.Name
+}
+
+func (td *BaseTable) GetColumns() []Column {
+	return td.Columns
+}
+
+func (td *BaseTable) GetPrimaryKey() *PrimaryKey {
+	return td.PrimaryKey
+}
+
+func (td *BaseTable) GetUniqueConstraints() []Unique {
+	return td.UniqueConstraints
+}