Created BugsnagMetricKitPlugin

[robert-smartbear]

Goal

Implemented initial MetricKit integration

Changeset

• Created a new BugsnagMetricKitPlugin that handles MetricKit diagnostics
• Created a new example app for metric-kit integration tests

Testing

Manual testing

[github-actions]

Bugsnag.framework binary size increased by 11,376 bytes from 787,016 to 798,392

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +3.8% +5.43Ki  +3.8% +5.43Ki    String Table
  +3.2% +5.20Ki  +3.2% +5.20Ki    Symbol Table
  +2.2% +5.15Ki  +2.2% +5.15Ki    __TEXT,__text
  +4.1% +2.06Ki  +4.1% +2.06Ki    __DATA,__objc_const
  +3.4% +1.02Ki  +3.4% +1.02Ki    __TEXT,__objc_methname
  +4.6%    +911  +4.6%    +911    __TEXT,__cstring
  +2.0%    +576  +2.0%    +576    __TEXT,__objc_stubs
  +3.1%    +438  +1.9%    +454    [12 Others]
  +2.1%    +448  +2.1%    +448    __DATA,__cfstring
   +14%    +360   +14%    +360    __TEXT,__gcc_except_tab
  +7.4%    +320  +7.4%    +320    __DATA,__objc_data
  +2.2%    +168  +2.2%    +168    __DATA,__objc_selrefs
  +3.1%    +136  +3.1%    +136    Lazy Binding Info
  +4.3%    +128  +4.3%    +128    Binding Info
  +3.5%    +128  +3.5%    +128    __TEXT,__unwind_info
  +6.7%     +90  +6.7%     +90    __TEXT,__objc_classname
  +4.2%     +80  +4.2%     +80    Rebase Info
  +2.8%     +60  +2.8%     +60    __TEXT,__stub_helper
 -74.5% -3.14Ki -30.2% -3.16Ki    [__DATA]
 -31.2% -8.36Ki -31.1% -8.36Ki    [__TEXT]
  [DEL]      -4 -72.0% -11.1Ki    [__LINKEDIT]
  +1.4% +11.1Ki  [ = ]       0    TOTAL

Generated by 🚫 Danger

[DariaKunoichi]

LGTM