feat(smithy-client): allow unambiguous type conversions in parse-utils

[kuhe]

Issue

internal P70766077

Description

• allow unambiguous type conversions instead of throwing
• e.g. expectNumber("5") gives 5 with warning instead of throwing "5" is not a number.
• e.g. expectString(5) gives "5" with warning instead of throwing 5 is not a string.

Testing

unit tests updated

[github-actions]

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