Support array fields

[BlackGad]

Current client API does not allow you to specify field schema for Array types.

I propose extending the C# API to include support for defining array field schemas, which would allow developers to specify the type of elements in the array along with constraints such as capacity and maxLength. Below are proposed methods to add to the API for defining array fields with both varchar and scalar types:

FieldSchema.CreateVarcharArray("field_id", capacity: 200, maxLength: 255, description: "Array of varchars"),
FieldSchema.CreateArray<float>("field_id", capacity: 200, description: "Array of scalar types")

[roji]

Thanks. Yeah, the SDK was originally developed against 2.2, and arrays were only introduced against 2.3 - we missed this. We'll take a look at implementing it.

[BlackGad]

As well as iterators. Crucial thing for our needs. https://milvus.io/docs/with-iterators.md

[BlackGad]

PR with an Array fields implementation #81
PR that implements Query with an iterator #80