refactor(usb): Split test device descriptors from mock class files

Previously, descriptors of the test devices were stored direclty in the mock
device files (e.g., "mock_[hid|msc].[h|c]"). This commit splits out the device
descriptors to separate files (e.g., "dev_[hid|msc].c") along with getter
functions.

Users that want to run the tests locally on a different device simply need to
update the "dev_[hid|msc].c" file for their device.

components/usb/test_apps/usb_host/main/ctrl_client.h

@@ -8,8 +8,6 @@
 
 typedef struct {
     int num_ctrl_xfer_to_send;
-    uint16_t idVendor;
-    uint16_t idProduct;
 } ctrl_client_test_param_t;
 
 void ctrl_client_async_seq_task(void *arg);