Do not use Linter error any more

[fabricereix]

LinterError are not easily maintained and not really useful.
We will simply delete them and simplify the hurlfmt --check usage as follow

$ hurlfmt --check  test.hurl
Would reformat: test.hurl
1 file would be reformatted

$ echo $?
1

[fabricereix]

Multiple input files are supported as follow:

$ hurlfmt --check  test1.hurl test2.hurl test3.hurl
Would reformat: test1.hurl
Would reformat: test2.hurl
2 files would be reformatted

[fabricereix]

The check output (Displaying files to be reformatted) are written to stdout,
while Parsing/IO Error are written to stderr.
It is possible to have both of them (one file in error does not prevent the other files to be processed)

$ hurlfmt --check test1.hurl test2.hurl test3.hurl
error: Parsing space
  --> test1.hurl:1:4
   |
 1 | GET
   |    ^ expecting a space
   |
Would reformat: test2.hurl
1 file would be reformatted