Configure Flutter Version Management

[Lohann]

Changes:

• [X] Use Flutter Version Management, so we can keep track of what version is supported in the project.
• [X] Install coverage as a local dependency
• [X] Graduate pre-release packages to release

[gabrielokura]

Flutter SDK Repo uses this command to automate updates on change log. Could be interesting to this project in the future

https://github.com/flutter/packages/tree/main/script/tool#update-changelog-and-version

[Lohann]

@gabrielokura Nice, we are using an library named Melos (Thank you @leonardocustodio !), it also have a command for automatically update the changelog of many packages at once!