ptig pager less/more support - pipe support

[clach04]

Add support to ptig to allow pipe support into processes, e.g. support for less/more (etc.) commands. See https://github.com/clach04/puren_tonbo?tab=readme-ov-file#readonly-pipe-into-editor

Unclear if process substitution could be implemented ala bash for read only editor/view support.

Process config could simply be:

'bat': '| bat',
'less': '| less',
...