[PLAT-8966] Add attemptDeliveryOnCrash

[nickdowell]

Goal

Add an optional mechanism for sending uncaught exceptions at crash time, prior to app termination.

Changeset

Adds attemptDeliveryOnCrash configuration option.

Adds attemptDelivery function pointer to BSG_KSCrash_SentryContext, which is set to BSGCrashSentryAttemptyDelivery if attemptDeliveryOnCrash is enabled.

The uncaught exception handler bsg_ksnsexc_i_handleException calls this function pointer, if available, after other threads have been resumed but before calling the original uncaught exception handler.

Testing

Adds an E2E scenario that verifies that

• delivery occurs at crash time
• mutations made by OnSendError are sent
• no further deliveries are made after relaunching the app

E2E fixtures now #import BugsnagInternals.h in order to increase BSGCrashSentryDeliveryTimeout to improve reliability on device farms.

[github-actions]

Bugsnag.framework binary size increased by 1,320 bytes from 705,368 to 706,688

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