policy: add function for retrieving the rules list
policy: add function for retrieving the rules list

Will be used in `GET /debuginfo`.

No functional change intended.

Related: #1942 (bugtool - tool to capture node/system information)
Signed-off-by: Alexander Alemayhu <e46fc836cca3acec03944314d1457c2ae6c68ef3@alemayhu.com>

scanf/cilium,cilium/cilium,cilium/cilium,scanf/cilium,cilium/cilium,eloycoto/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,scanf/cilium,tklauser/cilium,michi-covalent/cilium,cilium-team/cilium,eloycoto/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,scanf/cilium,tklauser/cilium,tgraf/cilium,eloycoto/cilium,tgraf/cilium,cilium-team/cilium,tgraf/cilium,tgraf/cilium,eloycoto/cilium,scanf/cilium,eloycoto/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium,tklauser/cilium,eloycoto/cilium