Cast Fw types in C++ codegen

[jwest115]

Related to nasa/fprime#3714, in C++ codegen, cast opcodes, event IDs, channel IDs, etc. to their respective types (ie: FwOpcodeType, FwEventIdType, FwChanIdType, etc.). This helps avoid implicit type conversion warnings that occur when building.

Partially addresses nasa/fprime#3529 (fprime updates are included in nasa/fprime#3714).

[bocchino]

This PR looks good and correct, but I thought we were moving towards having a single ID type for all these IDs. If we add all these casts, won't we just need to delete them later? Does anything go wrong now if we omit these casts?

[bocchino]

This helps avoid implicit type conversion warnings that occur when building.

Do these warnings occur when, for example, the channel ID type is smaller than the base ID type? If so, maybe the answer is to unify the types.

[jwest115]

I will double check the case of having the type smaller than the base ID type and get back to you!

[jwest115]

I ran without these changes and tried the case where FwChanIdType is smaller (U16) than the FwIdType (U32) and received the implicit conversion warnings. Currently in fprime, all of the id types are aliases of the FwIdType, maybe that is sufficient? However, if a user configures any of those id types to something different they will hit the warning.