Tools: Testbench: Convert file component to module adapter

[singalsu]

This is done as preparation for testbench IPC4 support. The update to IPC4 is simpler for a module adapter component.

[singalsu]

one question: will testbench support IPC3 and IPC4 both or after change, testbench only support IPC4?

I think there need to be separate executable build for IPC versions. The SOF headers are constructed in such way that I can't have both in the same time.