Generate Presigners that sign the querystring rather than headers

[kggilmer]

Presigned URLs are easier to work with than presigned requests, because of the extra complexity of serializing/deserializing lists of lists (headers). vs just a URL as a string.

Currently the SDK generates most presigners to use headers.

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[kggilmer]

Truth table for valid presigned operations of supported services using querystring rather than headers:

Service: S3 signedBodyValue: UNSIGNED-PAYLOAD hasBody: false location: QUERY_STRING (getobject) (GET)
Service: S3 signedBodyValue: UNSIGNED-PAYLOAD hasBody: false location: QUERY_STRING (putobject) (PUT)
Service: STS signedBodyValue: null hasBody: true location: QUERY_STRING (GET)
Service: Polly signedBodyValue: null hasBody: true location: QUERY_STRING (GET)

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[ianbotsf]

We'll handle this in smithy-kotlin#755.