When the capture source becomes "invalid" (because the display size
changes for example), a reset request is performed to restart the
encoder.
The reset state was stored in SurfaceCapture. The capture implementation
set the flag, and the encoder consumed it.
However, this mechanism did not allow a reset request to _interrupt_ the
encoder, which may be waiting on a blocking call (until a new frame is
produced).
To be able to interrupt the encoder, a reset request must not only set a
flag, but run a callback provided by the encoder. For that purpose,
introduce the CaptureListener interface, which is notified by the
SurfaceCapture implementation whenever the capture is invalidated.
For now, the listener implementation just set a flag as before, so the
behavior is unchanged. It lays the groundwork for the next commits.
PR #5432 <https://github.com/Genymobile/scrcpy/pull/5432>
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