[release] 0.55.0 - StatsigUser Typing Update + Publish Wheels (#395)

### New Features
- statsig is now published as a wheel as well as the source code on pypi
  ### Improvements
  - unit test improvement
  - typing changes





>Included In This Release
>- 9af94f2 kat-statsig
>   - unflakey the sampling test (#394)
>- 3d40456 kat-statsig
>   - use mapping for json types (#392)

statsig/version.py

@@ -1 +1 @@
-__version__ = '0.54.0'
+__version__ = '0.55.0'