Change to readonly collection and cleanup

Walkthrough

The pull request introduces modifications primarily to the SearchByMetadata method across various classes implementing the IVectorCollection interface. The return type of this method has been changed from Task<List<Vector>> to Task<IReadOnlyList<Vector>>, enhancing its immutability. Additionally, new methods have been added to some classes, such as IsValidJsonKey in VectorCollection, and several asynchronous methods in MongoVectorCollection. Overall, the changes focus on refining method signatures and improving type safety without altering existing functionalities significantly.

Changes

File Path	Change Summary
`src/Abstractions/src/IVectorCollection.cs`	Updated method signature: `SearchByMetadata` from `Task<List<Vector>>` to `Task<IReadOnlyList<Vector>>`.
`src/Abstractions/src/PublicAPI.Unshipped.txt`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`; added `IsValidJsonKey` method.
`src/Abstractions/src/VectorCollection.cs`	Added `protected static bool IsValidJsonKey(string input)` method for JSON key validation.
`src/Chroma/src/ChromaVectorCollection.cs`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`.
`src/Elasticsearch/src/ElasticsearchVectorCollection.cs`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`; added async methods with `NotImplementedException`.
`src/InMemory/src/InMemoryVectorCollection.cs`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`.
`src/Mongo/src/MongoVectorCollection.cs`	Added several async methods: `AddAsync`, `DeleteAsync`, `GetAsync`, `IsEmptyAsync`, `SearchAsync`; updated `SearchByMetadata` return type.
`src/OpenSearch/src/OpenSearchVectorCollection.cs`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`.
`src/Postgres/src/PostgresVectorCollection.cs`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`; added validation for filter keys.
`src/SemanticKernel/src/SemanticKernelMemoryStoreCollection.cs`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`.
`src/Sqlite/src/SqLiteVectorCollection.cs`	Updated `SearchByMetadata` return type to `IReadOnlyList<Vector>`; removed `IsValidJsonKey` method.

Possibly related PRs

#66: The changes in this PR involve the addition of the SearchByMetadata method to the IVectorCollection interface, which is directly related to the changes made in the main PR regarding the return type of the SearchByMetadata method.
#69: This PR modifies the SearchByMetadata method in the ChromaVectorCollection class, changing its access modifier and updating the exception message, which is relevant to the overall context of the SearchByMetadata method's implementation.
#73: This PR updates the SearchByMetadata method in the PostgresVectorCollection class, changing its access modifier and providing a functional implementation, which aligns with the changes made in the main PR regarding the method's return type.

🐇 In the code we hop and play,
With vectors in a new array.
Read-only lists, we cheer with glee,
Valid keys for JSON, oh so free!
Asynchronous methods, a joyful tune,
In our rabbit hole, we’ll code till noon! 🌼

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tryAGI / LangChain.Databases