find_patchwork_panels: Discover panels via gtable layout rows named '^panel-<num>' or '^panel-<row>-<col>'
Returns a data.frame with panel_index, name, t, l, row, col
Description
Discover panels via gtable layout rows named '^panel-<num>' or '^panel-<row>-<col>'
Returns a data.frame with panel_index, name, t, l, row, col