Added beta support for Canvas SmartSearch API (Issue #659)

[alportoricensis]

Proposed Changes

• Added beta support for Canvas' SmartSearch API (https://canvas.instructure.com/doc/api/smart_search.html#SearchResult), as requested in Add API coverage for SmartSearch #659.
• Included a smartsearch method within course.py to handle requests to the SmartSearch API
• Created SearchResult subclass within searchresult.py to adapt different responses from the SmartSearch API (which can return a page, an assignment, etc.) to existing CanvasAPI classes (Page, Assignment, etc.). Took into account extensibility and raising ValueErrors as the API is experimental and breaking changes could occur.
• Added tests for both additions, maintaining 100% statement coverage

Fixes #659.

This was completed as part of Homework #6 of EECS 481, Software Engineering, at The University of Michigan, which requires students to create a pull request for an open-source project. For more information, see https://eecs481.org/hw6.html.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (531638b) to head (83c4b5a).
Report is 8 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop      #690   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           74        75    +1     
  Lines         3764      3788   +24     
=========================================
+ Hits          3764      3788   +24     

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[Thetwam]

Thanks for your contribution! I made a bunch of tweaks to the code to match some real-world testing we did with this branch. If you have any questions, let me know. Thanks again! 👍