chore(core/protocols): preparatory fixes for schemas

[kuhe]

Issue

smithy-lang/smithy-typescript#1600
preparatory compatibility fixes for Schemas

Description

Fixes for unreleased features.

• fix for applying the LazyJsonString adapter in cases where the input is a JSON object rather than a string
• change test assertions to ignore ordering of query parameters
• return early for unit schema in XML shape deserializer
• fix to fully populate error fields in AwsQuery protocol
• defer content length determination to the contentLengthMiddleware rather than protocol methods

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts).
• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

[github-actions]

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