Torchode

Added

- Allow passing `dt_0` for the forward and backward pass in the backsolve adjoint

Changed

- Allow installation with pytorch 2.0 and recommend `torch.compile` in the readme

Fixed

- Ensure that `t0` and `direction` have compatible dtypes in `addcmul`

Fixed

- Replaced the `Status` enum with integer constants in internal code to avoid JIT
compilation issues on some PyTorch versions

Fixed

- Keep dtype of `y` stable in mixed dtype solving when selecting the initial step size

Changed

- Clamp the timestep to the integration range even for instances that are already finished
and in the selection of the initial step size