Implement server-side pagination for GraphQL queries

Ideally, this should be implemented in a way that it directly binds to PostgreSQL cursors all the way throush.

added part::backend label

changed title from IMplemente server-side pagination for GraphQL queries to Implement server-side pagination for GraphQL queries

assigned to @ZugBahnHof

added board::todo label

assigned to @yuha and unassigned @ZugBahnHof

will probably be solved in the course of the switchover from graphene to strawberry

Do we want this in this release or wait for strawberry in aleksis-core 5.0?