Add ImageOpto to JS SDK #1194
Description
IO is being finalized in Rust SDK we'd like to get started on adding IO to the JS SDK ASAP.
Please involve EdgeApps in the design/discussion
WIT: https://github.com/fastly/ExecuteD/pull/4434/files?file-filters%5B%5D=.wit&file-filters%5B%5D=.witx&show-viewed-files=true
IO Rust SDK: https://github.com/fastly/fst-compute-sdk-rs/blob/main/fastly/src/image_optimizer.rs
IO Initial PRs: https://github.com/search?q=repo%3Afastly%2FExecuteD%20is%3Apr%20author%3Apingihu%20author%3Accampbell&type=pullrequests
Design Doc: https://docs.google.com/document/d/1Uj1pdKL04oHbe99EGu4aHnM1_WMJ2UabNm_Q444SgDw/edit?tab=t.0#heading=h.9u4nvsktp9r