Description

Prefere JSON data type for storing session data instead of plain text. Fixes #24

Type of change

Please delete options that are not relevant.

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update

If an option is not relevant to your PR, do not delete it but use ~strikethrough formating on it~. This helps keeping track of the entire list.

[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation
[x] My changes generate no new warnings
[x] I have added tests that prove my fix is effective or that my feature works
[x] New and existing unit tests pass locally with my changes (not just the CI
[ ] Any dependent changes have been merged and published in downstream modules
[x] I have provided a link to the issue this PR adresses in the Description section above
[ ] I have updated the changelog
[x] I have labeled my PR using appropriate tags

Do not forget to @ the people that needs to do the review

Thanks for contributing! :pray: