Properly pad aliases for option usage

[p8]

When printing the options of a command, options without aliases are
padded so they align with options with aliases
The size of the padding is calculated by multiplying the max number of aliases
for an option by the number 4 (a dash, a letter, a comma and a space?).

Options can have aliases of arbitrary length, not just just a dash with
a single letter. For example in Rails the main option has the alias --master.
Also, the current implementation adds padding only to options without aliases.
So if one options has 1 alias and another has 2 aliases, the first option won't
get padding.

This all results in strange output when callings bin/rails new -h:

  -T, [--skip-test], [--no-skip-test]                            # Skip test files
          [--skip-system-test], [--no-skip-system-test]          # Skip system test files
          [--skip-bootsnap], [--no-skip-bootsnap]                # Skip bootsnap gem
          ...
          [--edge], [--no-edge]                                  # Set up the application with a Gemfile pointing to the main branch on the Rails repository
  --master, [--main], [--no-main]                                # Set up the application with Gemfile pointing to Rails repository main branch

When printing the usage for options we should look at the actual
formatted options.

Before (examples)

Usage:
  thor my_counter N [N]

Options:
  -t, [--third=THREE]   # The third argument
                        # Default: 3
          [--fourth=N]  # The fourth argument
  z, [--simple=N]
  y, r, [--symbolic=N]

After (examples)

Usage:
  thor my_counter N [N]

Options:
  -t,   [--third=THREE]  # The third argument
                         # Default: 3
        [--fourth=N]     # The fourth argument
  z,    [--simple=N]
  y, r, [--symbolic=N]

Fixes: rails/rails#47258

[p8]

Thanks @byroot !