Make the API plugin init synchronous so other hook processors can be run after

[childish-sambino]

Fixes

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Contributing to Twilio

All third party contributors acknowledge that any contributions they provide will be made under the same open source license that the open source project is provided under.

Short description of what this PR does:

• Make the API plugin initialization synchronous so future init hook processors will always be run after it completes

If you have questions, please file a support ticket, or create a Github Issue in this repository.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@bdf1775). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             master     #35   +/-   ##
========================================
  Coverage          ?   98.4%           
========================================
  Files             ?      22           
  Lines             ?     565           
  Branches          ?       0           
========================================
  Hits              ?     556           
  Misses            ?       9           
  Partials          ?       0

Impacted Files	Coverage Δ
src/hooks/init/twilio-api.js	100% <100%> (ø)
src/hooks/init/plugin-verification.js	100% <100%> (ø)

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[thinkingserious]

I like this, clean and readable :)