Create File resource with a file-like object

[FedericoNegri]

Description

The File resource now supports specifying passing a file-like object as src (alternatively to a file path). For instance:

File(
   name="file-object",
   evaluation_path="my-file.txt",
   type="text/plain",
   src=io.StringIO("this is a file"),
)

Checklist

Please complete the following checklist before submitting your pull request:

• I have tested these changes locally and verified that they work as intended.
• I have updated any documentation as needed to reflect these changes (if appropriate)
• I have verified that these changes to the best of my knowledge do not introduce any security vulnerabilities.
• Unit tests have been added (if appropriate)
• Test-cases have been added (if appropriate)
• Testing instructions have been added (if appropriate)