Add search history

It would be helpful to have something like `FX_SAVE_SEARCH=1` to save interactive mode's [cached search](https://github.com/antonmedv/fx/issues/216) between separate fx invocations.

Motivation: I frequently use fx to inspect multiple, similar Kubernetes objects, and am searching for the same fields for the 3-4 fx invocations in a row. As of today, I have to re-type my search query every time I fx a new object, which wastes a few distracting seconds and takes me out of flow state.

Thank you so much for a wonderful tool!