class SetConfigured

Inform the protocol server (of [`UsbFunctionInterface`]) when the USB device configured

state changes.

Called with `configured == true` in response to a `SET_CONFIGURATION` control request that

selects a configuration that contains this function. In this case, the protocol server

should use [`UsbFunction.ConfigureEndpoint`] to configure its endpoints.

Per USB 2.0 Specification Section 9.4.7, receiving a `SET_CONFIGURATION` request when the

function is already configured is valid and should reset/re-initialize the function state

rather than returning an error.

Called with `configured == false` when configuration is disabled or USB is disconnected.

The protocol server should then use [`UsbFunction.DisableEndpoint`] to disable its

endpoints.

The protocol server must perform all endpoint configuration/disabling and wait for those

calls to complete before replying to this method. This ensures that the protocol client can

report success/failure back to the host (by ACK'ing or STALL'ing the `SET_CONFIGURATION`

request).

Any error returned by this method causes the peripheral controller to stall Control

Endpoint 0, signaling a failure to the host (rejecting the `SET_CONFIGURATION` request).

* error:

* `ZX_ERR_BAD_STATE` if the device or function is in an uninitialized state where

configuration transitions are invalid (excluding re-configuring an active state).

* `ZX_ERR_INVALID_ARGS` if the speed or configuration parameters are invalid.

* `ZX_ERR_NOT_SUPPORTED` if the requested speed or configuration is unsupported.

* `ZX_ERR_NO_RESOURCES` if endpoint allocation or hardware configuration fails.