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/jackc/puddle/v2/doc.go

@@ -0,0 +1,11 @@
+// Package puddle is a generic resource pool with type-parametrized api.
+/*
+
+Puddle is a tiny generic resource pool library for Go that uses the standard
+context library to signal cancellation of acquires. It is designed to contain
+the minimum functionality a resource pool needs that cannot be implemented
+without concurrency concerns. For example, a database connection pool may use
+puddle internally and implement health checks and keep-alive behavior without
+needing to implement any concurrent code of its own.
+*/
+package puddle