[mlr] send MLR.req for local multicast addresses (#5248)

This commit includes:

- Adding compile configurations necessary for MLR features
- Adding source/header files necessary for MLR features
- Send MLR.req for local MAs on ThreadNetif
  - At most one MLR.req is outstanding
  - Reregistration according to PBBR configuration
  - Renewing periods according to PBBR configuration
- BBRs receive MLR.req with minimal processing and send MLR.rsp
- Add a test to verify that MLR.req is sent for local MAs.

script/test

@@ -52,6 +52,7 @@ build_simulation()
 
     if [[ ${version} == "1.2" ]]; then
         options+=("-DOT_DUA=ON")
+        options+=("-DOT_MLR=ON")
     fi
 
     if [[ ${VIRTUAL_TIME} == 1 ]]; then
@@ -89,6 +90,7 @@ build_posix()
 
     if [[ ${version} == "1.2" ]]; then
         options+=("-DOT_DUA=ON")
+        options+=("-DOT_MLR=ON")
     fi
 
     if [[ ${VIRTUAL_TIME} == 1 ]]; then