[ECS] [Events]: Add resource tags to ECS events

[nhlushak]

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Tell us about your request
It would be very nice if ECS event's structure had aws resource tags included to it. It has a lot of information about container definitions of task (if we are speaking about Task State Change events) but not tags, which makes processing of these events feature limited for us.

Which service(s) is this request for?
ECS

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
Our tech team has a lot of sub-teams working for different branches of business and we tag our resources accordingly to make sure all AWS resources are tagged according to system it is backing and team that maintains this system.
Processing ECS events might also be done using these tags so they could be delivered to different notification channels based ob resource tags.

Are you currently working around this issue?
Currently, we are doing the same thing, but with making event "enrichment" with invoking ECS API with Lambda, that receives original event.