Media Carousel implementation

[mhaugestad]

Added functionality to create a media carousel template and to send it alongside unit tests to confirm the json it produces matches what we should expect based on metas documentation.

[yehuda-lev]

Hi, thanks. 🙂
We will check it out.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.18182% with 3 lines in your changes missing coverage. Please review.

Project coverage is 87.13%. Comparing base (90e2419) to head (e0ca1bb).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pywa/types/template.py	93.18%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   86.39%   87.13%   +0.73%     
==========================================
  Files          16       16              
  Lines        3183     3226      +43     
==========================================
+ Hits         2750     2811      +61     
+ Misses        433      415      -18     

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