Add an overload to the recordException method to support additional attributes

[dengliming]

closes #1597

[codecov]

Codecov Report

Merging #1599 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1599   +/-   ##
=========================================
  Coverage     91.56%   91.56%           
- Complexity      985      988    +3     
=========================================
  Files           117      117           
  Lines          3603     3606    +3     
  Branches        314      315    +1     
=========================================
+ Hits           3299     3302    +3     
  Misses          208      208           
  Partials         96       96           

Impacted Files	Coverage Δ	Complexity Δ
api/src/main/java/io/opentelemetry/trace/Span.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
.../main/java/io/opentelemetry/trace/DefaultSpan.java	80.76% <100.00%> (+0.76%)	19.00 <1.00> (+1.00)
...ntelemetry/sdk/trace/RecordEventsReadableSpan.java	81.89% <100.00%> (+0.15%)	78.00 <1.00> (+2.00)

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[anuraaga]

Thanks!

[jkwatson]

one small simplification, and this will be good to go. Thanks for picking this up!