Langchain vector stores (#1003)

* Add early exit for streaming

* Add vectorstores for Langchain

* Trigger runs

* remove py37 and change code to support py38

* Change directory of metadata.source to run on github

* Fix flaskrestx testing manually

* Remove py312 (for now)

* Redirect instrumentation points

* First round of test changes

* Add test to find uninstrumented models

Co-authored-by: Timothy Pansino <TimPansino@users.noreply.github.com>
Co-authored-by: Hannah Stepanek <hmstepanek@users.noreply.github.com>
Co-authored-by: Uma Annamalai <umaannamalai@users.noreply.github.com>

* Finish reviewer updates

* Add SurrealDBStore to vectorstore list

* Modified mock server for OpenAI within LangChain

Co-authored-by: Hannah Stepanek <hmstepanek@users.noreply.github.com>

* Swap out metadata.source in test

* Remove commented out code

* Remove assert statement

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Co-authored-by: Hannah Stepanek <hstepanek@newrelic.com>
Co-authored-by: Timothy Pansino <TimPansino@users.noreply.github.com>
Co-authored-by: Hannah Stepanek <hmstepanek@users.noreply.github.com>
Co-authored-by: Uma Annamalai <umaannamalai@users.noreply.github.com>