Implementation: ECS Task Sets (#3152)

* initial implementation of taskSets.  Fixed a bug with ECS Service where task_definition was a required parameter.

* Added update_task_set and tests.  DRYed up ClusterNotFoundException. General cleanup.

* Added support for filtering tags on include parameter to describe_task_sets.  Added additional tests.

* Fix copy/pasta in ClusterNotFoundException

* styling updates

* Added TODO for delete_task_set force parameter

* Updated multiple function and constructor calls to use named variables.  Updated tests to reference variables instead of hardcoded strings.

* Run black for formatting

* Updated create_service function call to use named variables

IMPLEMENTATION_COVERAGE.md

@@ -3031,17 +3031,17 @@
 
 ## ecs
 <details>
-<summary>62% implemented</summary>
+<summary>73% implemented</summary>
 
 - [ ] create_capacity_provider
 - [X] create_cluster
 - [X] create_service
-- [ ] create_task_set
+- [X] create_task_set
 - [ ] delete_account_setting
 - [X] delete_attributes
 - [X] delete_cluster
 - [X] delete_service
-- [ ] delete_task_set
+- [X] delete_task_set
 - [X] deregister_container_instance
 - [X] deregister_task_definition
 - [ ] describe_capacity_providers
@@ -3049,7 +3049,7 @@
 - [X] describe_container_instances
 - [X] describe_services
 - [X] describe_task_definition
-- [ ] describe_task_sets
+- [X] describe_task_sets
 - [X] describe_tasks
 - [ ] discover_poll_endpoint
 - [ ] list_account_settings
@@ -3079,8 +3079,8 @@
 - [ ] update_container_agent
 - [X] update_container_instances_state
 - [X] update_service
-- [ ] update_service_primary_task_set
-- [ ] update_task_set
+- [X] update_service_primary_task_set
+- [X] update_task_set
 </details>
 
 ## efs