Make core component classes abstract and final

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.95%. Comparing base (5c04c80) to head (615ca1f). Report is 6 commits behind head on 0.4.x.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 0.4.x #1672 +/- ## ======================================= Coverage 95.94% 95.95% ======================================= Files 191 191 Lines 16717 16744 +27 Branches 3349 3371 +22 ======================================= + Hits 16039 16066 +27 Misses 468 468 Partials 210 210 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.