provider/aws: Support filtering in ASG data source

[radeksimko]

The original intention was to fix the following test failure:

=== RUN   TestAccAWSAutoscalingGroups_basic
--- FAIL: TestAccAWSAutoscalingGroups_basic (77.99s)
    testing.go:280: Step 1 error: Check failed: Check 2/2 error: data.aws_autoscaling_groups.group_list: Attribute 'names.#' expected "3", got "5"
FAIL

Looking up all ASGs in the whole region in an account which may not be used just for tests is a bit naive as things may change all the time (ASGs come and go as people are testing things), so I added filtering which allows us to scope ASGs via tags.

[grubernaut]

Nice addition, LGTM

[ghost]

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