[native] Increase WorkerThread MPMCQueue capacity to 500

Summary:
In ENG-9416, we encountered a scenario where the crypto WorkerThread gets filled up and fails to enqueue new tasks.

We have recently been increasing our use of the crypto thread, and in some cases we can enqueue a lot of tasks. I think it makes sense to increase this number.

Test Plan: I haven't directly tested this. I think the change is safe because I'm just increasing a number. I'll make sure that the app builds and runs on Android before landing

Reviewers: varun, will

Reviewed By: will

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13524