add api for identify using only traits

[prayansh]

Adds new api fun Analytics.identify(traits) that allows users to update traits without needing userId

[codecov-commenter]

Codecov Report

Merging #107 (21ac665) into main (6584e34) will increase coverage by 0.01%.
The diff coverage is 80.85%.

@@             Coverage Diff              @@
##               main     #107      +/-   ##
============================================
+ Coverage     78.04%   78.06%   +0.01%     
- Complexity      440      441       +1     
============================================
  Files            64       64              
  Lines          5644     5680      +36     
  Branches        706      710       +4     
============================================
+ Hits           4405     4434      +29     
- Misses          690      693       +3     
- Partials        549      553       +4     

Impacted Files	Coverage Δ
...ava/com/segment/analytics/kotlin/core/Analytics.kt	76.74% <80.76%> (+0.31%)	⬆️
...om/segment/analytics/kotlin/core/AnalyticsTests.kt	72.25% <80.95%> (+0.56%)	⬆️

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[wenxi-zeng]

LGTM. can we also have these apis in java compat?