[M120 Migration][MM] Create the factory class for MediaPlayer creation.

[M120 Migration][MM] Create the factory class for MediaPlayer creation.

MediaPlayer created in TizenRendererImpl varies depending on the platform
and a media stream type. It complicates the code and makes unnecessary
dependencies.
Therefore, use the factory pattern to increase scalability and
reduce code complexity and dependencies.

Refernce:
https://review.tizen.org/gerrit/#/c/293253/

Change-Id: I57c38e0f6973b57214c8cc04434107cfdca02023
Signed-off-by: Sun-woo Nam <sunny.nam@samsung.com>