Adding Insert() method to DataColumns to allow prepending data

I am replacing a **List** datatype with **DoubleDataFrameColumn** datatype in existing app - where the list (holds historical data (for example bars with stock data). List.Insert(0,data) always prepends - it inserts new data on top, using List.Insert() method to insert new data in front instead at the back.

DataFrameColumn (and all other DataFrame types) need **Insert()** or **Prepend()** method (just like the List type) alongside currently implemented **Append()** method, allowing inserting new values to the top of the Column instead of appending data to the bottom.

If DataColumn cannot be assembled and filled in the **reverse order** (the latest data on top, the oldest at the bottom), the access will require lots of remediation code - checking the length of the Column to get the latest element, calculating the position of elements to get the slice of the last x entries...

**Additional context**
DoubleDataFrameColumn pd = new("Column");
df.Append(100.0); //appends data to the bottom
**df.Insert(200.0,0);** // should insert data at the top, just like the List method does