Feat: Create dart implementation of multihash for use in dart_cid

[nelsonic]

As noted in /dwyl/learn-ipfs we believe that distributed networks are the future.
At the time of writing there is no dart implementation of multihash listed in: github.com/multiformats/multihash/#implementations

Our objective is to create one so that we can use it in our Flutter Project.
Putting in the effort up-front to do create a well-documented, tested & maintained package
will help save other people building "DApps" time.

Todo ✅

• Create World Class Documentation for how to use dart_multihash in a dart or Flutter project up-front. 📝
  • This could include a basic Flutter App similar to https://github.com/dwyl/flutter-counter-example
    or just have an /examples directory within this repo. Your pick! 💻
• Write tests for the function with reference to the Go, Rust or JS implementation (a known working example) 🧪
• Implement the code with all dart best practices for inline docs 🧑‍💻
• Publish the package to pub.dev under the @dwyl namespace/ownership for business continuity. 📦
• Open Pull Request to https://github.com/multiformats/multihash#implementations to add to list 🚀

Note: it's not a truly Decentralised App if people have to get it from a proprietary App Store ... but you get the idea. 💭

https://pub.dev/packages/multihash

https://pub.dev/packages?q=multihash

[nelsonic]

@LuchoTurtle the package should be called just multihash not dart_multihash
We don't need the word dart in any of the filenames:

dart pub publish --dry-run

Publishing dart_multihash 0.0.1 to https://pub.dartlang.org:
|-- .github
|   '-- ci.yml
|-- .gitignore
|-- CHANGELOG.md
|-- LICENSE
|-- README.md
|-- analysis_options.yaml
|-- dart_multihash.iml
|-- lib
|   |-- dart_multihash.dart
|   '-- src
|       |-- constants.dart
|       |-- models.dart
|       '-- varintUtils.dart
|-- pubspec.yaml
'-- test
    |-- dart_multihash_test.dart
    '-- dart_varint_test.dart

Please rename lib/dart_multihash.dart to lib/multihash.dart etc. (before we publish to pub.dev...) 🙏

[LuchoTurtle]

We shouldn't change it to multihash because we should follow the multiformat's convention. Every implementation has the language suffixed and I believe we should maintain this so we could successfully add our own to the list.

[nelsonic]

Good spot. 👍
Reluctantly. Agree. 👌
Please feel free to publish so you can continue making progress.
Then when you feel it's "stable" (V1.0), transfer to the newly created @dwyl verified publisher dwyl/learn-dart#22 (comment) 📦

[nelsonic]

@LuchoTurtle if you need to push directly to main to figure out the CI please do it.
This project is in "setup phase" so it's acceptable. 🔧
Once it's published we will protect main branch to avoid destruction. 🔥

[LuchoTurtle]

The package has been published and a PR has been opened to add it to the multiformats canonical repo.
Submitting for review so @nelsonic can close it.

[nelsonic]

@LuchoTurtle stoked you got your implementation published and PR adding it to the list merged. 🎉

[nelsonic]

Well done again. 🙌