bpf: Add support for tracing_multi link session

Adding support to use session attachment with tracing_multi link.

Adding new BPF_TRACE_FSESSION_MULTI program attach type, that follows
the BPF_TRACE_FSESSION behaviour but on the tracing_multi link.

Such program is called on entry and exit of the attached function
and allows to pass cookie value from entry to exit execution.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260606123955.345967-16-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

include/uapi/linux/bpf.h

@@ -1158,6 +1158,7 @@ enum bpf_attach_type {
 	BPF_TRACE_FSESSION,
 	BPF_TRACE_FENTRY_MULTI,
 	BPF_TRACE_FEXIT_MULTI,
+	BPF_TRACE_FSESSION_MULTI,
 	__MAX_BPF_ATTACH_TYPE
 };