upipe-modules: make all pipes throw ready and dead events

[JDarnley]

A small FYI.

I found these files by searching for all files which matched 'UPIPE_HELPER|upipe_throw_ready|upipe_throw_dead' meaning they were probably the main files for pipes. Then I filtered that list for files which did not match 'upipe_throw_dead' or 'upipe_throw_ready'.

Specifically I ran these commands:

vim $(rg --files-without-match upipe_throw_ready -- $(rg -l 'UPIPE_HELPER|upipe_throw_ready|upipe_throw_dead' lib/))
vim $(rg --files-without-match upipe_throw_dead -- $(rg -l 'UPIPE_HELPER|upipe_throw_ready|upipe_throw_dead' lib/))