New sources model for carp

[gostkin]

Tasks left:

• [x] Crate source / sink structures
• [x] Create engine
• [x] Adapt tasks to work with generalized format
• [x] Make oura source
• [x] Make cardano sink
• [x] Create new config format for the indexer
• [x] Test that sync works correctly (wip)
• [x] Add new configs