@Override
  public MergeContext setTerminalTotalDifficulty(final Difficulty newTerminalTotalDifficulty) {
    return postMergeContext.setTerminalTotalDifficulty(newTerminalTotalDifficulty);
  }
Instantiates a new Transition context.

@param preMergeContext the pre merge context
@param postMergeContext the post merge context
consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/TransitionContext.java