Add a new API to control logging behavior, particularly for implementing "log once" functionality and periodic logging. This helps avoid spamming logs with repetitive messages. The API provides: - Static and dynamic context creation - Configurable message identity calculation - Periodic reset capability - Context-aware logging macros - Element message variants with context support Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6855>