PE-6131 add pdf upload support to postgrid node npm package

[andrew-postgrid]

Context

Currently, the SDK do not support uploading PDFs to create an order from a PDF file. We want to add that support

Implementation detail

Using maybeMultipartFormRequestOptions which is already available. If options contains file uploads, convert to multipart/form-data. Also add type support (Uploadable) for pdf field.

Test Plan

Add some tests in tests/uploads.test.ts, should automatically run in CI

[CalvinPostgrid]

Is there anyway for us to annotate this in our open API spec to have this auto generated? Otherwise for future or other file uploads, we will need to remember to come here and upload the types.

[andrew-postgrid]

@CalvinPostgrid In TypeSpec, looks like we already do the right thing pdf: url | bytes. Stainless’s Node generator today looks like collapses that to string in the SDK, rather than recognizing byte or file. I feel what we can do is to add a post-process script and run it after every stainless regeneration, but here will be a lot of works here I guess.

[Aingkaran]

ill approve for now pending calvins comment if it can be addressed

[andrew-postgrid]

ill approve for now pending calvins comment if it can be addressed

Thanks !