bug/WriteConfig-API-Broken

[jasonbot]

Describe the bug
WriteConfig.to_json throws exceptions

To Reproduce

• Create an instance of any connector's WriteConfig (I used S3)
• write_config_object.to_dict(encode_json=True, redact_sensitive=True)
• Throws AttributeError: 'FilesystemWriteConfig' object has no attribute 'output_file'

Expected behavior

• No exception thrown