feat: support created_at filter for the GET /users endpoint (#15633)

Closes https://github.com/coder/coder/issues/12747

We support these filters currently:
https://coder.com/docs/v2/latest/admin/users#user-filtering, adding
`created_at` filter as well.

coderd/database/queries.sql.go

@@ -10404,16 +10404,27 @@ WHERE
 			last_seen_at >= $6
 		ELSE true
 	END
+	-- Filter by created_at
+	AND CASE
+		WHEN $7 :: timestamp with time zone != '0001-01-01 00:00:00Z' THEN
+			created_at <= $7
+		ELSE true
+	END
+	AND CASE
+		WHEN $8 :: timestamp with time zone != '0001-01-01 00:00:00Z' THEN
+			created_at >= $8
+		ELSE true
+	END
 	-- End of filters
 
 	-- Authorize Filter clause will be injected below in GetAuthorizedUsers
 	-- @authorize_filter
 ORDER BY
 	-- Deterministic and consistent ordering of all users. This is to ensure consistent pagination.
-	LOWER(username) ASC OFFSET $7
+	LOWER(username) ASC OFFSET $9
 LIMIT
 	-- A null limit means "no limit", so 0 means return all
-	NULLIF($8 :: int, 0)
+	NULLIF($10 :: int, 0)
 `
 
 type GetUsersParams struct {
@@ -10423,6 +10434,8 @@ type GetUsersParams struct {
 	RbacRole       []string     `db:"rbac_role" json:"rbac_role"`
 	LastSeenBefore time.Time    `db:"last_seen_before" json:"last_seen_before"`
 	LastSeenAfter  time.Time    `db:"last_seen_after" json:"last_seen_after"`
+	CreatedBefore  time.Time    `db:"created_before" json:"created_before"`
+	CreatedAfter   time.Time    `db:"created_after" json:"created_after"`
 	OffsetOpt      int32        `db:"offset_opt" json:"offset_opt"`
 	LimitOpt       int32        `db:"limit_opt" json:"limit_opt"`
 }
@@ -10458,6 +10471,8 @@ func (q *sqlQuerier) GetUsers(ctx context.Context, arg GetUsersParams) ([]GetUse
 		pq.Array(arg.RbacRole),
 		arg.LastSeenBefore,
 		arg.LastSeenAfter,
+		arg.CreatedBefore,
+		arg.CreatedAfter,
 		arg.OffsetOpt,
 		arg.LimitOpt,
 	)