Add ability to sign files in naruno/lib/sign.py

[sweep-ai]

Description

This PR adds the ability to sign files in the naruno/lib/sign.py file. It modifies the existing sign function to check if the data parameter is a file. If it is, the function reads the file and converts it to a string before proceeding with the existing logic. This allows users to sign files without adding a new parameter, utilizing the existing data parameter.

Additionally, the verify function in the naruno/lib/verify.py file has been modified to handle file signatures. If the path parameter points to a file, the function reads the file and loads the contents as the sign_json variable. This ensures that the verify function can handle both regular signatures and file signatures.

Summary of Changes

• Modified the sign function in naruno/lib/sign.py to handle file signatures by checking if the data parameter is a file and converting it to a string if necessary.
• Modified the verify function in naruno/lib/verify.py to handle file signatures by reading the file contents if the path parameter points to a file.

Please review and merge this PR. Thank you!

Fixes #1729.

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To checkout this PR branch, run the following command in your terminal:

git checkout sweep/sign-files_1

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