Data Profiling of selected data block

It would be nice if when a chunk of data is selected in the Data Editor when the Profiler opened, it looked only at the selected block.
It currently defaults to the entire file and requires users to manually enter the start, end (or length)

Start in the Data Editor selection handling and the Profiler entry point, then trace how the profiler currently initializes its start, end, or length values. Done means opening the Profiler with a selected block automatically profiles that block instead of the entire file, without requiring manual range entry.

Written by the indexing model from the issue text.