Support string size debug so it can be used for regular development.
It works be writing values into strings, ensuring the buffer size
given is actually available. Developers can use this with memory
checking tools such as ASAN/valgrind to force an error when
the value used for the size of a buffer is larger than the buffer.
Resolve remaining issue with RNA using BLI_strncpy* in generated
callback functions where the size argument didn't represent the
size of the destination buffer.
This is automatically enabled along with ASAN for the
blender_developer.cmake configuration.
Ref PR !107602.
7f8495c44b