Tracer refactor: SpanLifecycleHandler

[robert-smartbear]

No description provided.

[github-actions]

BugsnagPerformance.framework binary size increased by 5,112 bytes from 836,840 to 841,952

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +1.2% +2.90Ki  +1.2% +2.90Ki    String Table
  +1.2% +2.05Ki  +1.2% +2.05Ki    Symbol Table
  +0.6%    +216  +0.6%    +216    __DATA,__objc_const
  +2.0%    +192  +2.0%    +192    __DATA_CONST,__const
  +2.3%    +160  +2.3%    +160    __TEXT,__const
  +0.4%     +95  +0.4%     +95    __TEXT,__objc_methname
  +0.3%     +64  +0.3%     +64    __TEXT,__objc_stubs
  +0.5%     +40  +0.5%     +40    __TEXT,__unwind_info
  +1.2%     +24  +1.2%     +24    Function Start Addresses
  +0.2%     +18  +0.2%     +18    __TEXT,__cstring
  +0.8%     +16  +0.8%     +16    Rebase Info
  +0.3%     +16  +0.3%     +16    __DATA,__objc_selrefs
  +0.2%      +8  +0.2%      +8    Binding Info
  +1.0%      +8  +1.0%      +8    __DATA,__objc_ivar
  +0.1%      +5  +0.1%      +5    [1 Others]
  -0.4%     -68  -0.4%     -68    __TEXT,__gcc_except_tab
  -0.0%     -80  -0.0%     -80    __TEXT,__text
  -1.5%    -192  -1.5%    -192    [__DATA_CONST]
  -0.5%    -234  -0.5%    -234    [__TEXT]
  -9.6%    -240 -10.1%    -240    [__DATA]
  [ = ]       0 -33.8% -4.99Ki    [__LINKEDIT]
  +0.6% +4.99Ki  [ = ]       0    TOTAL

Generated by 🚫 Danger