Secrets Manager- Add secret type

[RaulRoPer]

Add the functionality to create a secret type to the custom extension.
https://duckdb.org/docs/stable/configuration/secrets_manager

[Giorgi]

@RaulRoPer I think the C API doesn't support that.

[RaulRoPer]

Hi @Giorgi !! I have reviewed it and I think you are absolutely right, although perhaps dudkb should extend that functionality to the C API. Is it possible to add parameters by name?
Thank you very much for creating DuckDB.ExtensionKit, it's amazing!

[Giorgi]

TVFs support named parameters: https://duckdb.org/docs/preview/clients/c/table_functions but the wrapper methods don't support them: https://github.com/Giorgi/DuckDB.ExtensionKit/blob/main/DuckDB.ExtensionKit/TableFunctions/TableFunctionExtensions.cs

[Giorgi]

@RaulRoPer Just pushed support for named parameters: https://github.com/Giorgi/DuckDB.ExtensionKit#2-define-your-extension

[RaulRoPer]

I've been thinking that perhaps I could use a scalar function to record credentials in a file and then refer to it. It's a shame that duckdb didn't implement the secret manager in its C API.

Named Parameters offer a lot of flexibility! Thank you so much! I love this extension kit!

@Giorgi ,W ill it also be included in the Nuget package DuckDB.NET.Data?

[Giorgi]

Yes, eventually I'll release it to NuGet, but I don't know whether it will be in the same package or not. Probably a separate one.