Defines the Params.mediaExt based on the type of parameters and its endpoint.
This method always assigns a value to params.mediaExt, defaulting to an empty string if indeterminable,
allowing detection of whether the function has been applied to the parameters.
Parameters
type: Type
The type of parameters to define.
params: Params
The parameters for which the media extension is to be defined
Defines the Params.mediaExt based on the type of parameters and its endpoint. This method always assigns a value to params.mediaExt, defaulting to an empty string if indeterminable, allowing detection of whether the function has been applied to the parameters.