getMaxBufferSize
Description
Returns the maximum video buffer memory size limit , in kilobytes.
This setting can be updated either by:
- calling the setMaxVideoBufferSize method.
 - instanciating an RxPlayer with a 
maxVideoBufferSizeproperty set. 
Syntax
const bufferSize = player.getMaxBufferSize();
- return value 
number: Maximum buffer memory size limit, in kilobytes.