Add CardEntity with repository and mapper to/from model

[magicDGS]

• Create CardEntity and CardRepository
• Create CardMapper for conversion between model and entity (and vice-versa)
• Add tests for repository and mapper

Second part of https://github.com/ygojson/ygojson-tools/issues/138

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.50000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 88.508%. Comparing base (a61ab95) to head (0b6eec0).

Files	Patch %	Lines
...b/ygojson/application/logic/mapper/CardMapper.java	72.727%	4 Missing and 2 partials :warning:
...db/converter/JsonStringListAttributeConverter.java	78.571%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #160 +/- ## =============================================== - Coverage 88.971% 88.508% -0.463% - Complexity 354 371 +17 =============================================== Files 57 63 +6 Lines 952 992 +40 Branches 84 85 +1 =============================================== + Hits 847 878 +31 - Misses 65 72 +7 - Partials 40 42 +2 ```

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