[Dev] Add some integration tests for the new solve #717
Description
- add some pb (e.g. quadrotor...)
@init- public API (e.g.
discretize) - reinclude some old tests from
.save, particularly forCTFlows - see https://github.com/control-toolbox/OptimalControl.jl/blob/develop/test/suite/solve/test_canonical.jl
- see https://github.com/control-toolbox/OptimalControl.jl/tree/develop/test/problems
- see https://github.com/control-toolbox/OptimalControl.jl/blob/develop/test/problems/TestProblems.jl