Print suggestions upon failing to find a package by name

[fsoikin]

Description of the change

Fixes #1184

• When looking up a package,
  • Either among workspace packages, e.g. spago build -p bogus-package
  • Or from a package set, e.g. dependencies: ["bogus-package"] or spago install bogus-package
• If the package is not there,
• Print a list of suggestions based on Levenshtein distance <= 2, and only top 5 in case there are too many.
• If there are no suggestions that are close enough:
  • When looking up among workspace packages, fall back to previous behavior of printing out all available packages.
  • When looking up in a package set, don't print anything.

 λ npx spago build -p spago-pg

<snip>
❌ The following packages do not exist in your package set:
  - effcet (did you mean: effect)
  - elmish-hml (did you mean: elmish-html)


 λ npx spago build -p mind

<snip>
❌ Selected package mind was not found in the local packages.
Did you mean:
  minder

 λ npx spago build -p bnder

<snip>
❌ Selected package bnder was not found in the local packages.
Did you mean:
  binder
  minder
  finder

 λ npx spago build -p flounder

<snip>
❌ Selected package flounder was not found in the local packages.
Did you mean:
  founder

 λ npx spago build -p fnder

<snip>
❌ Selected package fnder was not found in the local packages.
Did you mean:
  finder
  minder
  founder
  binder

 λ npx spago install bff

<snip>
✅ Selecting 6 packages to build:
    binder
    bound
    finder
    founder
    minder
    spago-pg

⚠️ You tried to install some packages that are already present in the configuration, proceeding anyways:
  - effcet

❌ The following packages do not exist in your package set:
  - bff (did you mean: aff, rdf, b64)
  - effcet (did you mean: effect)
  - elmish-hml (did you mean: elmish-html)

 λ npx spago build -p foobar

<snip>
❌ Selected package foobar was not found in the local packages.
All available packages:
  binder
  bound
  finder
  founder
  minder
  spago-pg

Checklist:

• Added the change to the "Unreleased" section of the changelog
• [ ] Added some example of the new feature to the README
• Added a test for the contribution (if applicable)

[fsoikin]

Making sure there are no packages accidentally fuzzy-matching "foo" or "bar".

[f-f]

Indeed, brilliant

[f-f]

Amazing ❤️