Text To Columns: Allow setting output format

[janezd]

Issue

Resolves part of #279: output formats.

In addition to what @wvdvegte wrote, the current output (0 and 1) is ambiguous: it looks like number, but these are "categories".

Description of changes

Adds output format which can be No / Yes, 0 / 1 (as number) or counts.

Includes

• Code changes
• Tests
• Documentation

[janezd]

I don't like this GUI. It looks to "technical". Suggestions welcome.

[Copilot]

Pull Request Overview

This PR adds output format options to the Text To Columns widget, allowing users to choose between different representations for the split column results. The change addresses the ambiguity of the previous 0/1 output by providing four distinct formats: "No/Yes", "0/1 (as categorical)", "0/1 (as numbers)", and "Counts".

• Introduces four output format options for Text To Columns widget
• Refactors existing classes to support both one-hot encoding and count-based outputs
• Extends test coverage for the new output format functionality

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
owtexttocolumns.py	Implements output format selection with new classes and UI controls
test_owtexttocolumns.py	Adds comprehensive tests for all output formats and refactors existing tests

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