Add methods to batch insert and delete records from Tableview

This is possible with the underlying Tableview.view (Treeview), but this api really needs to be exposed with easy to use methods. See this post for a use case.

class Tableview:
    ...

    def delete_rows(self, indices: List=None):
        """Delete rows specified in indices. If indices is None, then
        ALL tablerows are deleted.
        """
        ...

    def insert_rows(self, index: Union[int, str], rows: List):
        """Insert rows specified by index. If index does not exist then
        the records are appended to the end of the table. You can also
        specify the index 'END' to append records at the end of the
        table.
        ...

[antrrax]

but this api really needs to be exposed

In addition to the possibility of inserting or deleting lines. A method to update rows would be interesting.

For example, The line information would be loaded into an external form. The user changes the necessary data and updates this new data in the indicated row of the treeview.

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[israel-dryer]