cmake: Install snmpstats files

(cherry picked from commit f69b22ce3cdc2c06739c11f19c9ebeb5eb1727f3)

src/modules/snmpstats/CMakeLists.txt

@@ -7,3 +7,8 @@ find_package(NETSNMP REQUIRED)
 
 # TODO: Compiles fine but need to do some more verifcation
 target_link_libraries(${module_name} PRIVATE NETSNMP::NETSNMP)
+
+install(
+  DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/mibs
+  DESTINATION ${CMAKE_INSTALL_DATADIR}/snmp/
+  OPTIONAL)