Fixes incorrectly decoded querystring for GET requests

[BlenderDude]

Closes #120

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@as-integrations/aws-lambda	Minor

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[iiroj]

I believe this change causes issues for requests coming through an AWS API Gateway, because the API Gateway already decodes the parameters. Using difficult characters like % leads to double-decoding and produces a Malformed URI error with status code 400.

Is the intention that we manually encode them back before passing the event, or can this be considered a bug?