[extension/ecsobserver] Add service and task definition based matcher

[pingleig]

Description:

• Implement match task by service name (like k8s deployment name)
• Implement match task by task definition (btw: it is not same as service name, like pod template 'name')

Link to tracking Issue:

• Feature request [Feature Request] [Extension] ECS Service Discovery for Prometheus #1395

Pending PRs

• Exporter [extension/ecsobserver] Add exporter to convert task to target #3333

Previous PRs

• Fetch Task [extension/ecsobserver] Init service client and mock #3284
• Docker Label Matcher [extension/ecsobserver] Add docker label based matcher #3276
• Task IP and Port [extension/ecsobserver] Add get ip and port from task #3133
• Target and Task definition (merged) [extension][ecsobserver] Init config and target definition #2939
• Config PR (merged) [extension][ecsobserver] Init ECS Observer README #2377
• Original PR (closed) [extension][ecsobserver] Init ECS service discovery using docker label #2734

Testing:

unit test

Documentation:

No new doc. See existing doc

[pingleig]

cc @Aneurysm9 @anuraaga

[pingleig]

ping @anuraaga btw: there is also #3333