add support for streamed usb upload, multi thread usb uploads / dumps.

Some notes i made when adding stream support:
The tinfoil API makes it hard / impossible to multi thread the file upload because each data transfer passes the the file name and offset, meaning that it can and will change files and offset in the middle of a transfer
So that prevents the read thread from running freely in the background and the pull thread pulling data when requested.
The extension adds a flag to the usb header which if set, enables stream mode (same as ftp installs). This removes random access, but allows for multi threading as the data will be requested in order.

sphaira/include/usb/usb_uploader.hpp

@@ -31,7 +31,7 @@ struct Usb {
     }
 
     // waits for connection and then sends file list.
-    Result WaitForConnection(u64 timeout, std::span<const std::string> names);
+    Result WaitForConnection(u64 timeout, u8 flags, std::span<const std::string> names);
 
     // polls for command, executes transfer if possible.
     // will return Result_Exit if exit command is recieved.