Using this terminal size provider, your terminal will be set to a fixed size and will never receive any resize
events. Of course if the physical terminal is resized, in reality it will have a different size, but the application
won't know about it. The size reported to the user is always the size attached to this object.
Checks what the size of the terminal is, measured in number of rows and columns. The implementer of this
interface is expected to know which terminal we are querying for and have all it needs to figure out the size.
One way of implementing this could be to read of an external value or variable or calling IPCs or just return
a static size at all times.