Use jackson's `TypeReference` to deserialize into generic classes without warnings

[TheMythologist]

Closes #241

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v1

@TheMythologist submitted v1 for review.

• [v1 1/1] Use jackson's `TypeReference` to deserialize into generic classes without warnings

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git fetch https://github.com/se-edu/addressbook-level3.git refs/pr/242/1/head:BRANCHNAME

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[damithc]

Thanks for this PR, @TheMythologist We are likely to look into this after this semester is over. In the meantime, please submit a new version with a detailed commit message -- in AB3, we normally use a detailed commit message with a body (see https://se-education.org/guides/conventions/git.html)

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 75.28%. Comparing base (bd6718b) to head (8168ef1).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #242      +/-   ##
============================================
+ Coverage     75.26%   75.28%   +0.01%     
  Complexity      419      419              
============================================
  Files            71       71              
  Lines          1338     1339       +1     
  Branches        126      126              
============================================
+ Hits           1007     1008       +1     
  Misses          301      301              
  Partials         30       30              

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