[FR]: Add - (void)setNumberOfStackFramesToSkipForNotFatalErrors:(NSUInteger)frames to Crashlytics

[paulz]

Description

1. When reporting non-fatal error to Crashlytics we use our helper class to enable testing
2. This cause errors to be shown with same title on our dashboard.
   See non-fatal errors shown with same text when calling indirectly #11474
3. Proposal:
   1. add method to set number of stack trace frames to be skipped, e.g. - (void)setNumberOfStackFramesToSkipForNotFatalErrors:(NSUInteger)frames
   2. remove given number of frames from error stack trace when reporting

API Proposal

@interface FIRCrashlytics
- (void)setNumberOfStackFramesToSkipForNotFatalErrors:(NSUInteger)frames;
@end

Firebase Product(s)

Crashlytics

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[paulz]

similar to what BugSnag does:

https://docs.bugsnag.com/platforms/ios/customizing-error-reports/#modifying-stack-traces