By Gabriella Borter (Reuters) -Oklahoma lawmakers on Thursday gave final approval to a bill that would ban nearly all abortions and would allow private citizens to sue anyone who helps women terminate a pregnancy. The bill would take effect immediately upon being signed by Republican Governor Kevin Stitt, making it the most restrictive abortion ban in the United States. The Republican-backed legislation bans abortion from the moment of “fertilization,” making exceptions only in cases of medical emergency, rape or incest. The bill text says it does not prohibit the use of contraception or emerg…