Missing `"linspace"` timestep spacing option for `DDIMInverseScheduler`

**Is your feature request related to a problem? Please describe.**
I was wondering why the `"linspace"` timestep spacing option is not available also for the `DDIMInverseScheduler` class, as it is for other schedulers like `DDIMScheduler` and `DDIMScheduler`.
https://github.com/huggingface/diffusers/blob/9f06a0d1a4a998ac6a463c5be728c892f95320a8/src/diffusers/schedulers/scheduling_ddim_inverse.py#L284

**Describe the solution you'd like.**
The code could be copied from the other cited schedulers where it is already implemented.

Start in src/diffusers/schedulers/scheduling_ddim_inverse.py around line 284, then compare the timestep-spacing implementation in the cited DDIMScheduler files. Verify that DDIMInverseScheduler accepts the "linspace" option and behaves consistently with those existing schedulers; the change is complete when the option works without affecting the other spacing modes.

Scritto dal modello di indicizzazione a partire dal testo della issue.