Assert a std::fs::read_to_string(path) value is greater than another.
Pseudocode: std::fs::read_to_string(path1) > std::fs::read_to_string(path2)
let a ="alfa.txt"; let b ="bravo.txt"; assert_fs_read_to_string_gt!(&b, &a);
assert_fs_read_to_string_gt
assert_fs_read_to_string_gt_as_result
debug_assert_fs_read_to_string_gt