Cleaned up imports and forward declarations in Component class.
Cleaned up imports and forward declarations in Component class.

Refs idaholab/relap-7#19688
jessecarterMOOSE/moose,bwspenc/moose,idaholab/moose,milljm/moose,dschwen/moose,idaholab/moose,andrsd/moose,harterj/moose,idaholab/moose,milljm/moose,harterj/moose,sapitts/moose,bwspenc/moose,laagesen/moose,sapitts/moose,harterj/moose,jessecarterMOOSE/moose,sapitts/moose,lindsayad/moose,bwspenc/moose,andrsd/moose,dschwen/moose,bwspenc/moose,lindsayad/moose,idaholab/moose,laagesen/moose,andrsd/moose,idaholab/moose,sapitts/moose,lindsayad/moose,dschwen/moose,milljm/moose,laagesen/moose,jessecarterMOOSE/moose,sapitts/moose,andrsd/moose,jessecarterMOOSE/moose,jessecarterMOOSE/moose,dschwen/moose,lindsayad/moose,dschwen/moose,milljm/moose,harterj/moose,lindsayad/moose,laagesen/moose,andrsd/moose,laagesen/moose,milljm/moose,bwspenc/moose,harterj/moose