Initial Database Models

[rgaudin]

First stab at the base models for the CMS Backend: Language, Book, Title, Metadata, Tag

• using SQLachemy via databases and ormar for async-friendliness
• with basic tests
• updating invoke test task to change the database URL automatically

[codecov[bot]]

Codecov Report

Merging #35 (ff450da) into main (fd6da72) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              main       #35    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            2         4     +2     
  Lines           29       130   +101     
==========================================
+ Hits            29       130   +101     

Impacted Files	Coverage Δ
backend/src/backend/constants.py	100.00% <100.00%> (ø)
backend/src/backend/main.py	100.00% <100.00%> (ø)
backend/src/backend/models.py	100.00% <100.00%> (ø)

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