Improve dart pub points scoring on pub.dev

[mtrezza]

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server and the Parse Flutter SDK.

Issue Description

pub.dev pub points analysis shows:

1. Maybe we need to remove the upper bound <3.1.0 because pub.dev doesn't like clear compatibility specifications:

Unable to run pub upgrade.
The current Dart SDK version is 3.1.0-63.1.beta.

Because parse_server_sdk requires SDK version >=2.18.0 <3.1.0, version solving failed.

You can try the following suggestion to make the pubspec resolve:

• Try using the Dart SDK version: 3.0.0. See https://dart.dev/get-dart.

Also interesting, it's using a beta version of dart 3.1 (there has been no stable 3.1 release yet) to determine compatibility. An odd choice to let a beta version determine the public scoring of a package.

2. The package description is too short:

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

3. No example:

0/10 points: Package has an example
No example found.

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