Mark numerous key, password and connection string properties sensitive

[katbyte]

fixes #1239 & marked other fields sensitive in:

• data_source_cosmos_db_account
• data_source_eventhub_namespace
• data_source_kubernetes_cluster
• data_source_storage_account
• resource_arm_app_service
• resource_arm_app_service_slot
• resource_arm_application_insights
• resource_arm_container_registry
• resource_arm_cosmos_db_account
• resource_arm_eventhub_authorization_rule
• resource_arm_eventhub_namespace
• resource_arm_express_route_circuit
• resource_arm_express_route_circuit_authorization
• resource_arm_function_app
• resource_arm_iothub
• resource_arm_kubernetes_cluster
• resource_arm_log_analytics_workspace
• resource_arm_redis_cache
• resource_arm_relay_namespace
• resource_arm_servicebus_namespace
• resource_arm_servicebus_topic_authorization_rule
• resource_arm_storage_account
• resource_arm_virtual_network_gateway_connection

[tombuildsstuff]

LGTM 👍

[ghost]

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