Add the ability to insert/remove records from LocalListDataStore by index

[howudodat]

Please provide a way to insert a record to the data store, when a user adds a new row to the table, if the table is long, it's nice to have the new record at the top.

/**
  * Inserts a single record to the data store, updating both the original and filtered lists.
  *
  * @param record The record to be inserted.
  */
 public void insertRecord(T record) {
   original.add(0, record);
   List<T> newData = new ArrayList<>(original);
   setData(newData);
 }

or as an alternative:
public void addRecord(int index, T record)