Surface last manual stop date so the UI can display when stream was last paused

[MexicanSparker]

In the stream details there two ways of showing that a stream is stopped, when it got out of funds and finished running or when the user manually paused the stream, in this case we can only show that it was a manual pause but we cannot offer when it was paused.
The data represented by the Stream model does not have a date or timestamp field surfacing this info and it would be ideal to have it.