Establishing the policy of the State to promote and encourage the creation of accessory dwelling units on land with a single-family detached dwelling unit as the primary dwelling unit in order to meet the housing needs of the citizens of the State; requiring, on or before October 1, 2026, the legislative body of certain counties or municipal corporations to adopt a local law authorizing the development of accessory dwelling units on land with a single-family detached dwelling unit as the primary dwelling unit; etc.