Inconsisent naming of No-op behavior and types in SDK.

[jasdel]

The SDK uses different patterns for naming no-op behavior, e.g. smithyhttp.NopClient vs logging.Noop. These SDK should use a single standard naming for consistency.

[skmcgrail]

This also includes NoOpRetryer, TestingUsingNoOpSleep.

[jasdel]

Fixed in #987

[github-actions]

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