Configurable error event fields

[DariaKunoichi]

Goal

Enable user to skip some fields in the handled event field - breadcrumbs, threads, user, stacktrace, feature flags and custom metadata sections.

Changeset

Added BugsnagErrorOptions and BugsnagCaptureOptions classes. New overloads of notify methods for both Bugsnag and BugsnagClient.

Testing

Unit tests added, e2e in next PR.

[github-actions]

Bugsnag.framework binary size increased by 6,016 bytes from 752,992 to 759,008

    FILE SIZE        VM SIZE    
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  +1.4%    +405  +1.4%    +405    __TEXT,__objc_methname
  +1.0%    +288  +1.0%    +288    __TEXT,__objc_stubs
  +4.0%    +160  +4.0%    +160    __DATA,__objc_data
  +6.1%     +72  +6.1%     +72    Export Info
  +1.0%     +72  +1.0%     +72    __DATA,__objc_selrefs
  +2.7%     +48  +2.7%     +48    Rebase Info
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  +2.1%     +40  +2.1%     +40    Function Start Addresses
  +0.5%     +32  +0.5%     +32    [3 Others]
  +0.9%     +32  +0.9%     +32    __TEXT,__unwind_info
  +2.8%     +28  +2.8%     +28    __DATA,__objc_ivar
  +4.0%     +16  +4.0%     +16    __DATA,__objc_classlist
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 -15.0% -3.61Ki -14.9% -3.61Ki    [__TEXT]
  +0.8% +5.88Ki  +2.1% +16.0Ki    TOTAL

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