Loïc authored Mar 17, 2023 and Steve Lhomme committed Mar 24, 2023

This commit moves the remaining callbacks of stream/demux: pf_read/
pf_block/pf_seek/pf_readdir and pf_demux into their operations table,
aiming at unifying all the callbacks under a unique place.
This is a follow-up to the introduction of typed controls callbacks
for stream and demux.

Like for the typed controls callbacks if no operation is provided
(ie, stream_t/demux_t.ops is NULL) by a module, the legacy pf_* will be
used instead as a fallback.

The commit doesn't migrate any of modules yet.