@spec build_stas_locking_script(<<_::160>>, <<_::160>>, boolean()) ::
  {:ok, BSV.Script.t()} | {:error, term()}

Build a STAS v2 locking script.

Parameters

• owner_pkh - 20-byte public key hash of the owner
• redemption_pkh - 20-byte public key hash for redemption
• splittable - whether the token can be split