[FEATURE]: Support identifiers in ORDER BY and GROUP BY clauses

### Feature hasn't been suggested before.

- [x] I have verified this feature I'm about to request hasn't been suggested before.

### Describe the enhancement you want to request

Having `.orderBy` and `groupBy` accept `Name` arguments (e.g. `sql.identifier("foo")`) would improve their ergonomics. We wouldn't need to resort to the function signature to reference aliased columns in these clauses.

The following snippets should be equivalent:

```ts
db
.select({ now: sql`now()`.as('now') })
.groupBy(table => table.now)
```

```ts
db
.select({ now: sql`now()`.as('now') })
.groupBy(sql.identifier('now'))
```

The former works fine, whereas the latter does not.