[release] 0.47.0 - Remove output logger handler, extra logging thread…

…, and more unit tests (#353)

### Improvements
  - more unit tests around different dcs failure cases
  - one extra event logging thread to increase events throughput
- removed output logger handler and formatter. the user will now need to
have application level handler to see the logs





>Included In This Release
>- c388271 kat-statsig
> - sampling fixes and do not attach shadow sample when not needed
(#352)
>- a7b371c kat-statsig
>   - dcs fallback unit tests (#350)
>- 8e8a7dd kat-statsig
>   - Simplify logger logic more (#349)
>- aed9e2e kat-statsig
>   - remove handler and formatter from output logger (#348)
>- f91809f kat-statsig
>   - 2 log event threads (#346)

statsig/version.py

@@ -1 +1 @@
-__version__ = '0.46.0'
+__version__ = '0.47.0'