Fix bodySerializer for binary format request bodies
- Modified SDK operation.ts to check for binary format in request body schema
- Set bodySerializer to null for any request body with format: 'binary'
- Added test spec body-binary-format.yaml with examples
- Verified fix works correctly for application/zip, application/pdf, and application/octet-stream
Co-authored-by: mrlubos <12529395+mrlubos@users.noreply.github.com>