Pretty print improvements

[ElianCordoba]

• Replacement of PR Added function names to method handlers for pretty printing #138, addressing this comment which it was something not implemented in that PR
• Uses node-archy addressing this comment
  • Fix the following bug and added a test to cover it

  └── /
    ├── :a (GET)
        :b (PUT)         <- Character missing
    └── c/
        └── :c (GET)
  

• Added test to cover the new feature and updated old ones (since they all broke)
• Does not fix bug #82
• If merged, fastify#2048 will be affected

Output differences

before
└── / (GET|POST)
    ├── a (GET|PUT)
    │   └── /
    │       ├── :a (GET)
    │       └── b (GET)
    ├── b (GET)
    └── :test (GET)
        :test (PUT)
        └── /hello (GET)

after
/
├── (GET)
├── (POST)
│ 
├ a
│ ├── (GET)
│ ├── (PUT)
│ │ 
│ └ /
│   ├── :a (GET)
│   └── b (GET)
├── b (GET)
└ :                         <- Note here, this is diferent that before
  ├── :test (GET)
  ├── :test (PUT)
  │ 
  └── /hello (GET)

I had to do some monkey patching because the part of the tree generated by archy would not look good, not proud of that code but it works.

To be honest, I like the original output more but this new approach allows for the handler's name to be displayed.

[mcollina]

lgtm

[airhorns]

#170 included work that supersedes this, I think this can be closed

[delvedor]

Thank you for contributing @ElianCordoba!