[jaxrs][cxf-cdi] use InputStream for binary body

Created by: selliera

Use a single "InputStream" instead of "File" for requestBody that is binary string.

This allows the generated code to build in case of a definition like:

      requestBody:
        content:
          text/plain:
            schema:
              type: string
              format: binary

This fixes #9372 (closed) : without it, the generated code for that sample simply do not build.

PR checklist

• Read the contribution guidelines.
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  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh

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