Executor doesn't implement cetl::rtti

[thirtytwobits]

For example: https://github.com/OpenCyphal-Garage/libcyphal/blob/main/include/libcyphal/executor.hpp#L108
We have the same methods defined but they are not virtual and the cetl::rtti interface is not used.

[serges147]

The line you mention is not really about IExecutor but its Callback::Interface. But you are right - I need review all places where rtti is implemented. The reason why it's working currently (and not causing any problems I'm aware of) is b/c cetl::rtti_cast<> implementation is not requiring currently to inherit from cetl::rtti interface - @pavel-kirienko Pavel, is it a feature or a bug? ;)
IMO on one hand it could be a feature, namely:

• if you have very strict and predictable scenario from which type to what type you gonna rtti_cast
• then you don't really need it be polymorphic - executor's callback stuff proves it (for better or worse)

On the other hand, it is probably not good that we have rtti interface defined but don't enforce it properly... f.e. if I add to the interface a new pure virtual method then I would expect to see compilation failures about classes being abstract...

[pavel-kirienko]

That interface is mostly needed for the rtti_helper, so consider it a feature. We should implement that interface at least for regularity, though (making it final to avoid vtable lookup overheads where possible).