[ast-mapper] call mapping fns for name and variance in type_parameter_declaration_type_param
[ast-mapper] call mapping fns for name and variance in type_parameter_declaration_type_param

Summary: as titled. used to support D10512084, which needs to map those fields.

Reviewed By: dsainati1

Differential Revision: D10855450

fbshipit-source-id: 26e45a188bb021d0e3205f60ce6ca46ecd98d142

facebook/flow,samwgoldman/flow,popham/flow,AgentME/flow,gabelevi/flow,mroch/flow,jamesgpearce/flow,mroch/flow,samwgoldman/flow,facebook/flow,jamesgpearce/flow,facebook/flow,facebook/flow,gabelevi/flow,AgentME/flow,gabelevi/flow,gabelevi/flow,jamesgpearce/flow,AgentME/flow,popham/flow,popham/flow,gabelevi/flow,samwgoldman/flow,AgentME/flow,facebook/flow,popham/flow,popham/flow,popham/flow,mroch/flow,samwgoldman/flow,gabelevi/flow,jamesgpearce/flow,jamesgpearce/flow,AgentME/flow,jamesgpearce/flow,facebook/flow,mroch/flow,samwgoldman/flow,samwgoldman/flow,facebook/flow,popham/flow,mroch/flow,mroch/flow,gabelevi/flow,jamesgpearce/flow,samwgoldman/flow,mroch/flow