public void blockSelectionStarted() {
    blockSelectionStarted = true;
    uncommitedStates.add(duplicateLastState());
  }
Called at the start of block selection, when the initialization is done, to prepare a new
working state based on the initial state.

<p>After this method is called, it is not possible to call anymore {@link
#createSelectorState(TransactionSelector, Object, StateDuplicator)}
plugin-api/src/main/java/org/hyperledger/besu/plugin/services/txselection/SelectorsStateManager.java