pg-meta pg-format: arrayToList useSpace flag is dead, so nested arrays get a stray leading space

## Bug report - [x] I confirm this is a bug with Supabase, not with my own application. - [x] I confirm I have searched the Docs, GitHub Discussions, and Discord. ## Describe the bug `arrayToList` in `packages/pg-meta/src/pg-format/index.ts` takes a `useSpace` flag to decide whether a group is opened with `(` or ` (`, but both branches of the ternary are identical, so the flag has no effect: https://github.com/supabase/supabase/blob/master/packages/pg-meta/src/pg-format/index.ts#L75-L86 ```ts sql = useSpace ? safeSql`${sql} (` : safeSql`${sql} (` ``` `literal()` and `string()` call it as `arrayToList(index !== 0, element, …)`, i.e. "add a separating space only for groups that follow another element". Because the flag is dead, every group is opened with a space, so a nested array in the first position emits a stray leading space. `packages/pg-meta/src/pg-format` is a port of the [`pg-format`](https://www.npmjs.com/package/pg-format) package, and this is a divergence from it. Comparing the two directly: | input | `string()` (pg-meta) | `pg-format` `%s` | | --- | --- | --- | | `[[1, 2]]` | `" (1, 2)"` | `"(1, 2)"` | | `[[1, 2], [3, 4]]` | `" (1, 2), (3, 4)"` | `"(1, 2), (3, 4)"` | | `[1, [2, 3]]` | `"1, (2, 3)"` | `"1, (2, 3)"` ✅ | Only the leading-group case differs, which is exactly the case where `useSpace` should be `false`. `literal()` shows the same offset for nested arrays (`" ('a', 'b'), ('c', 'd')"` vs `"('a', 'b'), ('c', 'd')"`). ## To Reproduce ```ts import { literal, string } from './packages/pg-meta/src/pg-format' string([[1, 2], [3, 4]]) // " (1, 2), (3, 4)" — leading space literal([['a', 'b']]) // " ('a', 'b')" — leading space ``` Nested arrays are currently untested for `literal()`, and `string()` has no tests at all, which is why this went unnoticed — `test/pg-format.test.ts` only covers flat arrays (`literal([1, 2, 3])`). ## Expected behavior `useSpace === false` should open the group with `(`, so a leading nested array produces `…