Add --progress option to print progressive status and executed count

[lepapareil]

hurl version = 1.2.0

I write 4 test files, 3 will succeed, 1 will fail.

Currently I get:

$ hurl test*.hurl
error: Assert Status
  --> /dir1/dir2/dir3/file3.hurl:7:10
   |
 7 | HTTP/1.1 200
   |          ^^^ actual value is <500>
   |

What i expect using the new parameter --progress

$ hurl --progress test*.hurl
/dir1/dir2/dir3/file1.hurl: success         
/dir1/dir2/dir3/file2.hurl: success         
/dir1/dir2/dir3/file3.hurl: failure          
error: Assert Status
  --> /dir1/dir2/dir3/file3.hurl:7:10
   |
 7 | HTTP/1.1 200
   |          ^^^ actual value is <500>
   |
/dir1/dir2/dir3/file4.hurl: success

Which could give on screen:

[fabricereix]

For the next version, we can start by simply adding these 2 lines:

• FILENAME: running before running the test
• FILENAME: STATUS after runing the test

Replacing 'running' by the test status may not be possible if errors are printed.
We also need to clarify the behavior in verbose mode.

[fabricereix]

We can't really replace running by success| failure.
The cursor is rather moved with a terminal instruction such as tput.
In this case, the ouput would not be greppable anymore.