feat: Export client.EventFromMessage, client.EventFromException, and event.SetException

[cleptric]

Export the existing client.EventFromMessage, client.EventFromException, and the new event.SetException method to facilitate logging integrations.

refs #291 (comment)

[codecov]

Codecov Report

Patch coverage: 91.17% and project coverage change: -0.13 ⚠️

Comparison is base (eb22fb5) 80.03% compared to head (2e19be6) 79.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #607      +/-   ##
==========================================
- Coverage   80.03%   79.90%   -0.13%     
==========================================
  Files          38       38              
  Lines        3881     3887       +6     
==========================================
  Hits         3106     3106              
- Misses        669      673       +4     
- Partials      106      108       +2     

Impacted Files	Coverage Δ
interfaces.go	92.57% <86.36%> (-0.76%)	⬇️
client.go	88.92% <100.00%> (-0.57%)	⬇️

... and 1 file with indirect coverage changes

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[KevinSnyderCodes]

#608

This adds a new method Event.SetException() which decouples the Event creation and the setting of its Exception field. Client.EventFromException() now uses Event.SetException() under the hood.

This allows you to populate an Event with an exception and other data separately from the Client before calling Client.CaptureEvent().

[tonyo]

@cleptric merged #608 into this PR (thanks @KevinSnyderCodes), and added a few docstrings. Should be good to go, I think 👍