feat(image): add image upload support

[NeverBehave]

Fixes: #520

This PR adds automatic file upload support for endpoints that accept files (e.g., image attachments, device type images).

Changes:

• Auto-detect file-like objects in create()/save() data and switch from JSON to multipart/form-data encoding
• Support for single and multiple file uploads in one request
• Added helper functions _is_file_like() and _extract_files() in query.py

[jeremystretch]

@NeverBehave please don't request reviews from individuals unless someone has previously volunteered. We utilize a rotation for assignment of reviewers.

[NeverBehave]

@jeremystretch The request is sent automatically(and won't be able to deselect) by Github since this repo has defined CODEOWNERS, which was added 7 month ago by @arthanson

Reference: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#about-code-owners

[jeremystretch]

My mistake, thanks for pointing that out. Not sure why that was added as it's not needed. I've opened #717 to remove it.

[arthanson]

@NeverBehave this looks very good, just a couple questions below.

[NeverBehave]

@arthanson thanks for the review. Both cases updated with corresponded tests covered.

Let me know if there is any other concerns.

[arthanson]

@NeverBehave some of the tests are failing, can you please check