This PR contains the implementation of an integration with
[OpenSearch](https://opensearch.org/). As one of the growing vector
databases in the open source world, adding support for it to this
project makes total sense. This implementation includes:
1. A complete implementation of the `EmbeddingStore` interface.
2. Unit tests for the major use cases a store must implement correctly.
3. Usage of [TestContainers](https://testcontainers.com/) to automate
the execution of backends.
deep-learning-dynamo