[riot-notifications] [RIOT-OS/RIOT] sys/irq_handler: Drop module (#15386)

[Marian Buschsieweke]

### Contribution description

The module `sys/irq_handler` made it into a release due to bad timing, as `sys/event_thread` was deemed as the better solution just after the feature freeze. It has been deprecated right during the release it was included in (via the release notes).

This PR finally drops it.


### Testing procedure

The CI will figure out if there are any in-tree users still present.

### Issues/PRs references

None
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/15386

-- Commit Summary --

  * sys/irq_handler: Remove deprecated module
  * LOSTANDFOUND.md: Add sys/irq_handler

-- File Changes --

    M LOSTANDFOUND.md (8)
    D sys/include/irq_handler.h (253)
    D sys/irq_handler/Makefile (1)
    D sys/irq_handler/irq_handler.c (94)
    D tests/sys_irq_handler/Makefile (8)
    D tests/sys_irq_handler/Makefile.ci (10)
    D tests/sys_irq_handler/main.c (170)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15386.patch
https://github.com/RIOT-OS/RIOT/pull/15386.diff

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