feat: ICE

[enthusiastmartin]

Initial ICE implementation.

TODO:

• [ ] docs, comments, readme
• [ ] benchmark
• [x] tests implementation (stubs)
• [ ] add math test for bying lrna
• [x] solution weight calculation
• [x] improve solution validation
• [ ] dont allow submit_solution to be tipped
• [ ] dont allow submit_solution in batch
• [x] slash proposer in case of invalid solution
• [ ] router address allowed to buy lrna ( needed to set route) - it should not be allowed to.
• [ ] on_success/on_failure hooks
• [x] solver using convex optimization