[Feature] coding style guide new content suggestions

[cecille]

Feature description

...

Content suggestions from the original PR:

casting:
Use C++-style casts (e.g. static_cast) for type conversions instead of C-style casts.
Whenever possible, use SafePointerCast from SafePointerCast.h instead of reinterpret_cast for pointer casting, since it is safer and adds alignment and type safety checks.
Avoid casting function pointers to void *, as this is considered undefined behavior in C++. (we currently have LambdaBridge.h that can be used as alternative, I dont know if its sensible to add it here)

Use Span/ByteSpan instead of C-style pointers for buffers

Variable, class, file naming?
PascalCasing
constexpr preferred to defines
class enum
Maybe some guidance for .gn file structure

refs:
#36275 (comment)
#36275 (comment)
#36275 (comment)

Platform

core

Platform Version(s)

No response

Anything else?

No response