Json & XML Dbcodecs

[AugustNagro]

Resolves #27

[guizmaii]

Made a comment you're free to ignore as it can be more complicated to implement: https://github.com/AugustNagro/magnum/pull/49/files#r1807555435

Otherwise, I like the approach :)

[AugustNagro]

Thanks for the review @guizmaii . It's a very interesting suggestion to use https://blog.7mind.io/no-more-orphans , I like the idea a lot.

I wonder can we merge these codecs as-is, and then experiment with adding the Optional codecs per https://blog.7mind.io/no-more-orphans in a new MR? I want to make sure I fully understand the implications.