feat: plumb multipart form encoding in fdr

[abvthecity]

Plumbs through content-type within multipart form-data.

Also renames FileUpload to FormData for clarity.

Also fixes multipart form example generation inside FDR (by implementing requestBodyV3), although this should probably happen further upstream (in fern cli)... as a result this should fix the curl example generation.

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snapshot test updated: https://github.com/fern-api/fern-platform/pull/780/files#diff-e098c79359d4943e85809e256c6a594ddb051bbc0f54fb9fff102fc834a2c3d0

deletes all instances of requestBody/responseBody in favor of requestBodyV3 and responseBodyV3 (since this the frontend only reads from v3). This will significantly reduce the amount of gzipped data that is sent over the wire.

---

not (fully) tested: multipart form snippet

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Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Failed to fetch blobToDataURL(app/src/api-playground/Playground... View Issue

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