[new module] Azure Traffic Manager profile module (#43812)

* add traffic manager client and models in azure_rm_common
- add traffic manager management client
- import traffic manager models to 'traffic_manager_models' proprety
- azure.mgmt.trafficmanager doesn't have models(), so use direct import
for now

* add traffic manager facts module

* add traffic manager module

* add integration test for two modules

* fix package info in requirements

* fix sanity check

* fix monitor config default value

* fix facts module doc

* move model import into module

* resolve comments except seprating endpoint

* remove endpoint operation

* fix test after removing endpoint operation

* change module name to azure_rm_trafficmanagerprofile/facts

* fix sanity test

* seperate endpoint into delegate module

* fix typo

* fix lint

* fix lint

* fix test

* fix test

* resolve comments

* fix test

* fix test

* fix test

* fix bug in return

* resolve comments

* fix lint

* fix lint

* add sample in endpoint module

packaging/requirements/requirements-azure.txt

@@ -17,6 +17,7 @@ azure-mgmt-rdbms==1.2.0
 azure-mgmt-resource==1.2.2
 azure-mgmt-sql==0.7.1
 azure-mgmt-storage==1.5.0
+azure-mgmt-trafficmanager==0.50.0
 azure-mgmt-web==0.32.0
 azure-nspkg==2.0.0
 azure-storage==0.35.1