Code revision

Problem/Motivation

Code has been growing for a while without proper revision.

Steps to reproduce

Visit https://git.drupalcode.org/project/votingapi_reaction and check the code.

Proposed resolution

Go through the code and analyze for possible improvements based on latest API and standards changes. Important to keep compatibility with Drupal 10.

Remaining tasks

- Perform analysis and update this issue with finding as a list of tasks
- TBD.