api: add a policy_name field to kprobe, tracepoint and uprobe events

All the plumbing was actually done, it was only missing the faucet. The
policy name was stored in the kprobe, tracepoint or uprobe tables
entries. It's only for uprobe that we also needed to copy the policy
name from the internal API event to the unix event. Then for all three,
the missing piece was the copy form the unix event to the gRPC API
event.

Signed-off-by: Mahe Tardy <[email protected]>

api/v1/README.md

@@ -788,6 +788,7 @@ https://github.com/opencontainers/runtime-spec/blob/main/config.md#createcontain
 | return | [KprobeArgument](#tetragon-KprobeArgument) |  | Return value definition of the observed kprobe. |
 | action | [KprobeAction](#tetragon-KprobeAction) |  | Action performed when the kprobe matched. |
 | stack_trace | [StackTraceEntry](#tetragon-StackTraceEntry) | repeated | Kernel stack trace to the call. |
+| policy_name | [string](#string) |  | Name of the Tracing Policy that created that kprobe. |
 
 
 
@@ -824,6 +825,7 @@ loader sensor event triggered for loaded binary/library
 | subsys | [string](#string) |  | Subsystem of the tracepoint. |
 | event | [string](#string) |  | Event of the subsystem. |
 | args | [KprobeArgument](#tetragon-KprobeArgument) | repeated | Arguments definition of the observed tracepoint. TODO: once we implement all we want, rename KprobeArgument to GenericArgument |
+| policy_name | [string](#string) |  | Name of the policy that created that tracepoint. |
 
 
 
@@ -842,6 +844,7 @@ loader sensor event triggered for loaded binary/library
 | parent | [Process](#tetragon-Process) |  |  |
 | path | [string](#string) |  |  |
 | symbol | [string](#string) |  |  |
+| policy_name | [string](#string) |  | Name of the policy that created that uprobe. |