[WIP] New package for Autoscaling tags functionality

[ewbankkit]

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Relates #10688.
Relates #10689.
Relates #9049.
Relates #6375.

WIP of an implementation of Autoscaling service tagging functionality similar to that for other AWS services in the keyvaluetags package, but without code generation.

Release note for CHANGELOG:

TODO

Output from acceptance testing:

TODO

[ewbankkit]

TODO

After #13515, tags is also of type schema.TypeSet, so the SetSchema/ListSchema distinction needs to be rethought.
Also, in resourcetags.New, the []interface{} case should be collapsed into the *schema.Set case.

[ewbankkit]

Replaced by #13868.

[ghost]

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