[Helper] Messaging: add msg_*_once macros to display a message only once per component instance

[fredroy]

A lot of code throw message in often-called functions such as draw() or update() or in loops.
and often, a boilerplate code like

static bool first = true;
if (first)
{
 msg_*() << "blabla"
 first = false;
}

is used, like for example in #6152 , when you want to warn the user once in the draw method, but dont want to spam.

So I asked Claude to implement a msg_*_once function to display only once per component (this part of code is quite... special)

Introduces msg_info_once / msg_warning_once / msg_error_once / msg_fatal_once /  msg_deprecated_once / 
msg_advice_once, which emit their message only the first time  a given emitter instance reaches the call site (tracked per-
instance, per-thread via a  lock-free thread_local set). Useful to avoid spamming repeated warnings from update loops. 
Includes a unit test (onceMessagePerInstance) verifying the per-instance behavior.

The only small flaw is that the OnceTracker is thread-local so If emitted from different threads it will be displayed more than once. But the other alternative was a std::mutex (his first version) so it could introduce uncessary locks IMO

I flagged experimental because the Messaging part is a bit complex...

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