[rosidl_generator_cpp] Generate constructors that take all msg members as arguments

[jmachowinski]

Feature request

Feature description

It would be nice, if for every msg a constructor would be generated, that takes all msg members as arguments.
There would be some positive effects from this:

• Compile time check if msg was modified
• Makes it harder to 'forget' to initialize a member
• Enforces RVO

Implementation considerations

Would slightly raise compile times
Default constructors must stay for compability

[alsora]

FYI, see this old discussion on the topic: #749
The purpose was different though.

In that case, we wanted to avoid to pay the cost for a default initialization.
The solution we discussed in that case was based on the use of aggregate initialization with designated initializers, which requires C++ 20 (currently ROS uses C++ 17).