Functionality to add images to cache inMemory and keep them there

[ChrisChV]

Context

Currently, the logic of InMemory cache is to save the image streams in a limited buffer (with a default size), and when the buffer is full and you need to save a new image, then the oldest image is deleted to save the new one.

New functionality

In some cases is needed to save an image in memory permanently and have control of when deleted.