v1.8.1

## What's Changed
* feat: azure entra and managed identity integration by @sk-portkey in https://github.com/Portkey-AI/gateway/pull/580
* Add workflow for running gateway tests by @narengogi in https://github.com/Portkey-AI/gateway/pull/707
* Change scheduling link by @vrushankportkey in https://github.com/Portkey-AI/gateway/pull/731
* Add fallback for message index in google chat complete by @narengogi in https://github.com/Portkey-AI/gateway/pull/729
* bug: delete unused submodule folder `vercel-app` by @noy4 in https://github.com/Portkey-AI/gateway/pull/716
* add a few supported input parameters for openai by @narengogi in https://github.com/Portkey-AI/gateway/pull/726
* chore: pass context and params to prerequestvalidator by @sk-portkey in https://github.com/Portkey-AI/gateway/pull/703
* fix: zod validation for vertex by @b4s36t4 in https://github.com/Portkey-AI/gateway/pull/733
* chore: openai add new 'prediction' param by @narengogi in https://github.com/Portkey-AI/gateway/pull/734
* chore: run tests only on commenting "run tests" by @narengogi in https://github.com/Portkey-AI/gateway/pull/736
* [New plugin] Simple plugin to allow whitelisting models as a guardrail by @elentaure in https://github.com/Portkey-AI/gateway/pull/695
* Adding model and provider reference routes by @roh26it in https://github.com/Portkey-AI/gateway/pull/732
* Add encoding_format and dimensions to supported params for azure openai by @narengogi in https://github.com/Portkey-AI/gateway/pull/746
* docs: add Japanese README file by @eltociear in https://github.com/Portkey-AI/gateway/pull/742
* Add Qdrant as a provider to the gateway by @roh26it in https://github.com/Portkey-AI/gateway/pull/759
* feat: combine successive user messages in bedrock by @narengogi in https://github.com/Portkey-AI/gateway/pull/749
* remove additional line separator at the end of bedrock converse message transform by @narengogi in https://github.com/Portkey-AI/gateway/pull/762
* Feat: openai and azure-openai realtime api support by @VisargD in https://github.com/Portkey-AI/gateway/pull/758
* 1.8.1 by @VisargD in https://github.com/Portkey-AI/gateway/pull/763

## New Contributors
* @noy4 made their first contribution in https://github.com/Portkey-AI/gateway/pull/716

**Full Changelog**: https://github.com/Portkey-AI/gateway/compare/v1.8.0...v1.8.1