[Request]: `LinuxRuntimeData` is not accessible by callers of the API client

[jglogan]

Feature or enhancement request details

The API client defines:

    /// Create a new container with the given configuration.
    public func create(
        configuration: ContainerConfiguration,
        options: ContainerCreateOptions = .default,
        kernel: Kernel,
        initImage: String? = nil,
        runtimeData: Data? = nil
    ) async throws {

A client serializes runtimeData with a structure, like LinuxRuntimeData that is specific to the targeted runtime, and the data is opaque to the API server.

At present a client cannot pass LinuxRuntimeData because Plugins/RuntimeLinux, an executable target, defines it.

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