Update CODEOWNERS to include datadog-ffe-ffi and team

Author: sameerank

.github/CODEOWNERS

@@ -23,6 +23,7 @@ data-pipeline*/             @Datadog/libdatadog-apm
 datadog-tracer-flare        @Datadog/libdatadog-apm
 ddsketch                    @Datadog/libdatadog-apm @Datadog/libdatadog-telemetry
 datadog-ffe                 @Datadog/feature-flagging-and-experimentation-sdk
+datadog-ffe-ffi             @Datadog/feature-flagging-and-experimentation-sdk
 
 # Most of the bin_tests are owned by the profiling team, but some are owned by the core team
 bin_tests/                  @Datadog/libdatadog-profiling