[release] 0.44.0 - Bug fixes on initialization timeout and api fallba…

…ck, new is_initialized api (#326)

### New Features
  - new api Is_initialized -> bool
  ### Improvements
  - reduce thread usage in background logging
  - add error message to diagnostics
  - make custom error message more clear
  - perf optimization on 100/0 pass percentage rules evaluation
  ### Fixes
- fix initialization timeout not being obeyed in special http request
cases
   - fix get dcs fall back to statsig network when 204
   - fix sdk config key name






>Included In This Release
>- 47ca4b1 Xin Li
>   - fix: network request in another thread (#322)
>- c942b5e Weihao Ding
>   - optimize: eval pass percent process (#325)
>- f88cefa kat-statsig
>   - fix import err (#324)
>- 0d617b8 kat-statsig
>   - Add override with proxy config address (#319)
>- 6f59e18 kat-statsig
>   - is initialized method (#323)
>- 798f3aa kat-statsig
>   - add has update and parse success to spec store (#321)
>- a912ac0 kat-statsig
>   - some error logging rework (#320)
>- dc13798 kat-statsig
>   - fix sdk config key name (#317)
>- 598b088 Xin Li
>   - add diagnostics error message (#318)
>- a371464 kat-statsig
> - move dropped event logging to logger and add logging interval (#310)

statsig/version.py

@@ -1 +1 @@
-__version__ = '0.43.1'
+__version__ = '0.44.0'