[mlr] add MulticastListenersTable on BBR (#5292)

This commit adds the Multicast Listener Table for BBR:

- Implements Multicast Listener Table on BBR
  - Adds registered MAs to MulticastListenerTable
  - Reject when the table is full or the multicast address is invalid
    and return failed status
  - Respond with unsuccessful status along with failed addresses
  - Expire Listeners from MulticastListenerTable per second (using
    MinHeap for better performance)
- MLR enhancement
  - Re-register only failed multicast addresses (used to register all
    registering multicast addresses)
- Reference Device only APIs
  - Some APIs are defined for reference devices and tests.
- Add tests
  - Add unit test: test_multicast_listener_table.cpp (runs for 1.2-bbr
    only)
  - Add functional tests

script/test

@@ -138,16 +138,30 @@ do_clean()
     rm -rfv "${OT_BUILDDIR}" || sudo rm -rfv "${OT_BUILDDIR}"
 }
 
-do_unit()
+do_unit_version()
 {
-    local builddir="${OT_BUILDDIR}/cmake/openthread-simulation-${THREAD_VERSION}"
+    local version=$1
+    local builddir="${OT_BUILDDIR}/cmake/openthread-simulation-${version}"
+
     if [[ ! -d ${builddir} ]]; then
-        echo "Cannot find build directory!"
+        echo "Cannot find build directory: ${builddir}"
         exit 1
     fi
 
-    cd "${builddir}"
-    ninja test
+    (
+        cd "${builddir}"
+        ninja test
+    )
+}
+
+do_unit()
+{
+    do_unit_version "${THREAD_VERSION}"
+
+    if [[ ${THREAD_VERSION} == "1.2" ]]; then
+        do_unit_version "1.2-bbr"
+        do_unit_version "1.1"
+    fi
 }
 
 do_cert()