Finds all .isox files in a folder.
Examples
# all .isox files provided with the isoorbi package
orbi_find_isox(system.file("extdata", package = "isoorbi"))
#> [1] "/home/runner/work/_temp/Library/isoorbi/extdata/testfile_dual_inlet.isox"
#> [2] "/home/runner/work/_temp/Library/isoorbi/extdata/testfile_dual_inlet_new.isox"
#> [3] "/home/runner/work/_temp/Library/isoorbi/extdata/testfile_flow.isox"
#> [4] "/home/runner/work/_temp/Library/isoorbi/extdata/testfile_shotnoise.isox"