feat(Google Slides): Add support for Google Slides

[reachtokish]

What: Added Google Slides support

Why: Fixes issue #96

How: Added GoogleSlides.js and necessary tests

Checklist:

• Documentation
• Tests
• Ready to be merged
  

Hi @MichaelDeBoey, I have raised this PR so that this plugin can support to embed Google Slides. I have written the required codes for that and also added tests. Though npm run test:update failing and throwing error Jest: "global" coverage threshold for branches (100%) not met: 99.16% - like this. I think I could not cover tests for all the codes.

Kindly check whole the things and please let me know what else I have to do to make it all fix. I'm quite new in gatsby and also I've never used this plugin but wanted to give a try.

Thanks!!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bb5b8a8) to head (cea1763).
Report is 74 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #114   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        17    +1     
  Lines          215       227   +12     
  Branches        27        27           
=========================================
+ Hits           215       227   +12     

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