McpClientFactory should accept an IClientTransport instead of McpServerConfig

[eiriktsarpalis]

Currently, it is not possible to use McpClientFactory with custom transports. Instead, the factory accepts a generic McpServerConfig object that the factory uses to construct the right transport. This makes it difficult to spin up custom transports such as in-memory transports for testing purposes. We should consider removing McpServerConfig replacing it bespoke factories for each of the built-in client transport implementations.

[eiriktsarpalis]

As a temporary workaround, the createTransportFunc delegate can be used to insert a custom transport into the client:

csharp-sdk/src/ModelContextProtocol/Client/McpClientFactory.cs

Line 50 in 729e688

Func<McpServerConfig, ILoggerFactory?, IClientTransport>? createTransportFunc = null,

[stephentoub]

Closing as duplicate of #190