Refactor the distributed schemes for the new API

[rheitjoh]

(This issue has been imported from the Gitlab repository because it seems to not have been addressed yet)

Original Text (Issue 52)

This should be done after the keys (public parameters, public key, private keys) are representable. More specific, they should be decoupled and implemented as separated classes. Then they should know how to represent themselves.

Comments

Refer to the original issue for comments.

[rheitjoh]

Seems like there was work on this issue on branch https://git.cs.upb.de/ag-bloemer/sis/compare/develop...52-craco-refactor-the-distributed-schemes-for-the-new-api .

Also potentially related to #15 as that branch also contains that scheme.