Support class component (HOC)

[halitogunc]

This PR enables react-wait to use in a class component via injected prop #8 and also contains some refactoring stuffs that I wanted to request your comments. @f

I tested all functionality on my machine and it worked, but I didn't prepare test cases yet. This is why it is work in progress. Since tests were added, it is not the case anymore.

Waiting for the review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e2ad406) to head (e7c30de).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #11   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         5    +3     
  Lines           23        35   +12     
  Branches         2         4    +2     
=========================================
+ Hits            23        35   +12     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[halitogunc]

just sending you a kindly reminder @f