DB integration

[jshyunbin]

Implemented DB handler that will be used for GraphQL queries and mutations (#13)

Still needs DB utilization in Queries and Mutation functions (using dummy data at this point)

[jshyunbin]

TODO:

• create review table
• set chars(characteristics) and moods into different type in DB for easier filtering

[codecov[bot]]

Codecov Report

Merging #56 (b9bdd3c) into main (1375045) will increase coverage by 19.11%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             main       #56       +/-   ##
============================================
+ Coverage   80.88%   100.00%   +19.11%     
============================================
  Files           9         2        -7     
  Lines         450       158      -292     
  Branches        2         2               
============================================
- Hits          364       158      -206     
+ Misses         86         0       -86     

see 7 files with indirect coverage changes

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