* Source says IPO may be considered from 2023 (Adds financial details, writes through): PARIS (Reuters) - French media firm Banijay will pay about 2 billion euros for Endemol Shine, the production house behind global television hits such as “The Voice” and “Black Mirror”, creating a new leader in reality TV, game shows and TV series, sources said. Banijay said in a statement it had entered into a definitive agreement to acquire 100% of Endemol Shine. It gave no financial details, but two sources familiar with the situation said the transaction was worth about 2 billion euros ($2.2 billion).