Editor - provide API

[AMBudnik]

Description

Our editor-related docs are lacking some basic methods on how to open, close, or handle editor values.

We mention getActiveEditor but that's it. There are some methods listed in the baseEditor, but they are not well explained and there's no demo.

In the result, to open an editor for a cell 0, 0 (just like it would happen for double click) we need to call 3 methods

hot.selectCell(0,0);
hot.getActiveEditor().enableFullEditMode();
hot.getActiveEditor().beginEditing(hot.getDataAtCell(0,0));

Your environment

• Handsontable version: 8.0.0
• Browser Name and version: n/a
• Operating System: n/a