[PLAT-9798] Simplified BugsnagPerformance.start API

[robert-smartbear]

Goal

Simplify BugsnagPerformance.start API

Changeset

Since there’s only one user-controllable thing that can go wrong when BugsnagPerformance starts, we don’t really need the complication of declared Swift errors and return status values.

Testing

Unit Tests

[github-actions]

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [NEW]      +4  +3.1%    +220    [__LINKEDIT]
  +3.9%     +88  +3.9%     +88    Binding Info
  +2.5%     +88  +2.5%     +88    __TEXT,__cstring
  +0.4%     +63  +0.4%     +63    [__TEXT]
  +1.2%     +32  +1.2%     +32    Lazy Binding Info
  +0.1%     +32  +0.1%     +32    Symbol Table
  +0.7%     +32  +0.7%     +32    __DATA,__cfstring
  +0.5%     +32  +0.5%     +32    __TEXT,__objc_stubs
  +0.3%     +16  +0.3%     +16    __TEXT,__objc_methname
  +1.4%     +12  +1.4%     +12    Indirect Symbol Table
  +1.0%     +12  +1.0%     +12    __TEXT,__stub_helper
  +1.0%     +12  +1.0%     +12    __TEXT,__stubs
  +6.2%      +8  +6.2%      +8    __DATA,__got
  +1.0%      +8  +1.0%      +8    __DATA,__la_symbol_ptr
  +2.4%      +8  +2.4%      +8    __DATA,__objc_classrefs
  -1.5%     -27  -1.5%     -27    __TEXT,__objc_methtype
  -0.5%     -28  -0.5%     -28    __TEXT,__gcc_except_tab
  -0.4%     -64  -0.4%     -64    [__DATA]
  -0.3%    -160  -0.3%    -160    __TEXT,__text
  -0.5%    -384  -0.5%    -384    String Table
  -0.1%    -216  [ = ]       0    TOTAL

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