Allow filename changes for open graph image generation

[moog16]

Goals

1. more control over file names and extensions on generated og:image tags
2. decrease SEO bot crawler warnings

Non-Goals

No response

Background

My team has been using the vercel/og-image generation library, and it has worked great! The one feature we'd like to see is to be able to change the filename, or file extension. Google bot crawlers detect the URL on our page, and is treating them like HTML pages instead of images. This is an avoidable issue, as the solution seems simple (although I'm sure it isn't).

Proposal

Add a prop or function argument to allow the filename change or a file extension change.