Statsig

- Adds ability to override layers in test.
- Adds `user_hash` to get client initialize response





>Included In This Release
>- b5f0dcc6b34a75656eb8858d35df14b2b13781e8 Daniel
> - Add Layer Override APIs (201)
>- 303665f1d23376499c2535a317cd1edb5320b8c1 sroyal-statsig
> - Bootstrap User Hash (200)

**Full Changelog**: https://github.com/statsig-io/python-sdk/compare/v0.20.0...v0.21.0

When we first wrote local evaluation SDKs, we were worried about backwards compatibility for new conditions and operators, so we introduced a way to ensure backwards compatibility to old SDKs: issue a network request if the evaluation is inconclusive.

Fast forward, and we've realized this was a poor design decision. Good for backwards compatibility, but not worth the tradeoff and risk of potentially introducing a network round trip to every request.

We also now have evaluation metadata to surface if you try to evaluate something that is not supported on your SDK version to communicate the incompatibility in console.

Moving forward, our API will make a strong guarantee - all checks will be evaluated locally and will not issue a network request for evaluation.

**Full Changelog**: https://github.com/statsig-io/python-sdk/compare/v0.19.1...v0.20.0

- Make debug logs disabled by default. To enable, pass the option `enable_debug_logs` on initialize
- Move print during ErrorBoundary error handling inside try/catch

**Full Changelog**: https://github.com/statsig-io/python-sdk/compare/v0.19.0...v0.19.1

* Added type annotations to API
* Added support for evaluating multiple gate condition

**Full Changelog**: https://github.com/statsig-io/python-sdk/compare/v0.18.0...v0.19.0

Option to provide a custom output logger to redirect stdout/stderr messages sent from the SDK.

**Full Changelog**: https://github.com/statsig-io/python-sdk/compare/v0.17.1...v0.18.0

Internal Diagnostic:
- Fix a bug which resulted in all diagnostics timestamps being set to the same value.

Background threads:
- Added descriptive names to each background thread the SDK spawns.

**Full Changelog**: https://github.com/statsig-io/python-sdk/compare/v0.17.0...v0.17.1