Fix: Handle Binary files correctly in Serverless Toolkit

[dcanonmolina]

This is a fix to help the Serverless Toolkit to serve binary files. It could help to fix the issue: #421

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[AndreLars]

Please add the needed checks to successfully run tests
On line 321
Property 'type' does not exist on type 'string'.
Property 'data' does not exist on type 'string'.

[makserik]

@dcanonmolina are you still working on this?

[makserik]

See the comment in #421