[Model] Create iOS ModelPlayer implementation
Created attachment 444390 [details] Patch
Created attachment 444395 [details] Patch
Created attachment 444397 [details] Patch
Created attachment 444400 [details] Patch
Created attachment 444486 [details] Patch for landing
Committed r285922 (244331@main): <https://commits.webkit.org/244331@main>
<rdar://problem/85496710>