docs: Improve pubspec metadata

[ABausG]

Description

Improve Pubspec Metadata by adding Funding Link, Topics and Screenshots

Checklist

• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation and added code (documentation) comments where necessary.
• I have updated/added relevant examples in example or documentation.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9e86097) to head (08cdbbd).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #283   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          104       104           
=========================================
  Hits           104       104           

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