Ash.Type.File support

[maennchen]

Continuation of ash-project/ash#1337
Based on ash main, needs a release to be merged.

Features

• File can be provided as Base64 string in JSON body
• File can be sent as part of a multipart request and referenced in JSON body

Issues

• Swagger UI can't deal with additionalProperties in multipart
• Swagger UI can't deal with content type that is not exactly multipart/form-data
• Support is probably not great in generated clients for multipart

Future tasks

• Igniter add parser to endpoint on setup

Contributor checklist

• Bug fixes include regression tests
• Features include unit/acceptance tests

[zachdaniel]

Very excited about this, will take a look on Monday 🙇

[zachdaniel]

I think we can merge this even w/ the current issues that you've pointed out. I'm thinking the issues laid out would be things we could go forward on as opposed to requiring reworking. For example:

1 & 2. SwaggerUI - the only way forward I can think of here is for this to be resolved on swagger UIs end. We can't accept everything as multipart/form-data
3. we'll have to cross that bridge when we come to it.

Had one comment for discussion, and we can merge once that is settled.

[zachdaniel]

Alright, I think we're good to merge, and we'll roll forward on the swagger UI/codegen issues as people need to leverage these things and/or run into issues. Sound good @maennchen ?

[maennchen]

@zachdaniel Agreed 👍