Content retrieval (and anything calling .get) only works for JSON

[DanL12186]

Describe the bug
Attempting to retrieve the content of files via the API doesn't work unless the files are in JSON format; you'll get a JSON::ParserError error, because get() in http.rb calls jsonparsel() which calls JSON.parse(response) for every request.

For example, when trying to retrieve an image so we can attach it via ActiveStorage in order to easily display it to the user:

>> client.files.content(id: "file-xyz123")
JSON::ParserError: 451: unexpected token at '?PNG

Simply returning the response if it's not JSON would resolve this.

To Reproduce
Steps to reproduce the behavior:

1. Have the API generate a file for you
2. Call client.files.content(id: file_id)
3. See error

Expected behavior
It should retrieve non-JSON content like generated PNGs successfully

Desktop (please complete the following information):

• OS: MacOS X 10.15.7
• Browser Chrome
• Version 121

[leoplct]

Same issue.
The API supports the parameter purpose="assistants" and accepts several formats.

UPLOAD FILE: https://platform.openai.com/docs/assistants/tools/passing-files-to-code-interpreter
Accepted formats: https://platform.openai.com/docs/assistants/tools/supported-files

Here the library code: https://github.com/alexrudall/ruby-openai/blob/main/lib/openai/files.rb