[Blazor] Investigate speeding up InputFile

* For large file uploads, we don't seem to be using all the possible bandwidth and latency seems to be playing an important role on the time it takes for an upload to complete.
* We can evaluate whether we want to further speed this up or switch to an alternate mechanism for Blazor Web (since we could issue a regular POST request to the same page with a special handler for the InputFile and pass that data to the circuit)