Feat: implement sticky notes functionality #7

[jkarenzi]

what does this PR do?

This PR implements CRUD operations for sticky notes

Description of the task to be completed

• Implement endpoints for managing sticky notes
• Write appropriate documentation for resulting endpoints
• Implement appropriate error handling and responses
• Write comprehensive unit tests

How can this be manually tested?

• By sending requests to the api/sticky_notes endpoints

Swagger documentation screenshot

Test screenshot

What are the relevant pivotal trackers/story id?

• Feat: CRUD Sticky notes #7

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.09%. Comparing base (b20ee9a) to head (bef0145).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop       #9      +/-   ##
===========================================
+ Coverage    92.50%   94.09%   +1.59%     
===========================================
  Files           13       17       +4     
  Lines          200      254      +54     
  Branches        16       20       +4     
===========================================
+ Hits           185      239      +54     
  Misses          14       14              
  Partials         1        1              

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