[native] Configure iOS Hermes with the same default RuntimeConfig as Android
[native] Configure iOS Hermes with the same default RuntimeConfig as Android

Summary: I was noticing OOM crashes because the app uses just about 500 MiB. I investigated some more and realized that the Hermes default is 512 MiB, which Android overrides to 1024 MiB, and iOS does not override. I further investigated the Android Hermes config and figured it wouldn't hurt to copy it over to iOS. More context in [this GitHub comment](https://github.com/facebook/hermes/issues/511#issuecomment-883185729).

Test Plan: Make sure iOS stops crashing when logged in with my user

Reviewers: karol-bisztyga, palys-swm

Reviewed By: palys-swm

Subscribers: KatPo, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D1764

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