chore: support analyzer 3.0.x

[dkrutskikh]

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix
[ ] New rule
[ ] Changes an existing rule
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

What changes did you make? (Give an overview)

Is there anything you'd like reviewers to focus on?

[github-actions]

Dart Code Metrics analyze report of dart_code_metrics. ✅

Summary

• Scanned folders: bin, example, lib, test

• Total scanned files: 350

• Total lines of source code: 6212

• Total classes: 235

• Average Cyclomatic Number per line of code: 0.35 / 1

• Average Source Lines of Code per method: 6

• Total tech debt: 1018.0 hours

• Found issues: 6 ⚠

[codecov]

Codecov Report

Merging #618 (6c06a86) into master (9ebab5a) will not change coverage.
The diff coverage is n/a.

❗ Current head 6c06a86 differs from pull request most recent head 4d78171. Consider uploading reports for the commit 4d78171 to get more accurate results

@@           Coverage Diff           @@
##           master     #618   +/-   ##
=======================================
  Coverage   85.92%   85.92%           
=======================================
  Files         230      230           
  Lines        4917     4917           
=======================================
  Hits         4225     4225           
  Misses        692      692           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 144b0cb...4d78171. Read the comment docs.