Sync integration branch with next and update CrossTalk API

[yousif-bugsnag]

Goal

Merge the latest changes from next and update the CrossTalk API in light of #357

Testing

Updated the CrossTalk API unit tests

[github-actions]

BugsnagPerformance.framework binary size increased by 5,800 bytes from 520,296 to 526,096

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [ = ]       0  +265% +10.3Ki    [__LINKEDIT]
  +2.4% +2.96Ki  +2.4% +2.96Ki    String Table
  +2.6% +2.59Ki  +2.6% +2.59Ki    Symbol Table
  +2.0% +2.28Ki  +2.0% +2.28Ki    __TEXT,__text
  +4.7%    +880  +4.7%    +880    __DATA,__objc_const
  +3.1%    +384  +3.1%    +384    __TEXT,__objc_stubs
  +1.6%    +247  +1.6%    +247    __TEXT,__objc_methname
  +1.6%    +192  +1.6%    +192    __TEXT,__gcc_except_tab
  +2.5%    +191  +2.5%    +191    __TEXT,__cstring
  +5.4%    +162  +5.4%    +162    __TEXT,__objc_methtype
  +9.5%    +160  +9.5%    +160    __DATA,__objc_data
  +1.2%    +132  +1.4%    +156    [11 Others]
  +1.8%     +88  +1.8%     +88    __TEXT,__unwind_info
  +2.2%     +72  +2.2%     +72    __DATA,__objc_selrefs
   +10%     +59   +10%     +59    __TEXT,__objc_classname
  +0.9%     +32  +0.9%     +32    Lazy Binding Info
  +3.1%     +32  +3.1%     +32    Rebase Info
  +0.6%     +32  +0.6%     +32    __DATA_CONST,__const
  -2.1%     -48  -2.1%     -48    [__DATA_CONST]
 -17.0% -1.13Ki -17.6% -1.15Ki    [__DATA]
  -8.1% -3.60Ki  -8.1% -3.60Ki    [__TEXT]
  +1.1% +5.66Ki  +3.1% +16.0Ki    TOTAL

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