Disallow reserved name `portNum` from port definition

[Kronos3]

Say you have:

port P(portNum: FwIndexType)

This will generate:

...
(
        Fw::PassiveComponentBase* callComp,
        FwIndexType portNum,
        FwIndexType portNum,
...

And an compiler error like this:

In file included from /Users/tumbar/git/fprime/FppTestProject/cmake-build-debug/FppTest/topology/ports/ReplyPortAc.cpp:7:
/Users/tumbar/git/fprime/FppTestProject/cmake-build-debug/FppTest/topology/ports/ReplyPortAc.hpp:54:21: error: redefinition of parameter 'portNum'
   54 |         FwIndexType portNum,
      |                     ^
/Users/tumbar/git/fprime/FppTestProject/cmake-build-debug/FppTest/topology/ports/ReplyPortAc.hpp:53:21: note: previous declaration is here
   53 |         FwIndexType portNum,
      |                     ^
1 error generated.