[roll] Roll fuchsia [ui][input-pipeline] add trace events for input handlers

When adding a handler to the input pipeline, instrument the handler's
task with a Fuchsia Trace `duration`.

This provides a "catch-all" or "backstop" trace of task duration
for all input handlers. This backstop has some known limitations:
1. The duration does not distinguish between time spent on the
   CPU, and time spent `await`-ing some `Future`.
2. The duration only provides the highest-level accounting of
   the elapsed time for each loop on an InputHandler's task.
3. The backstop only accounts for time spent in the `Task`s
   created by `InputPipelineAssembly:add_handler()`. This
   excludes, for example, the `Task` that informs Flatland of
   the new cursor transform.

For input handlers where we want to distinguish active/awaiting
time, or where we want a more fine-grained breakdown of the work,
we'll add additional instrumentation within the handler.

Similarly, for `Task`s not created by `add_handler()`, we'll
add more instrumentation in later CLs.

Design note
-----------
The instumentation passes the `handler_name` into the duration as an
argument, rather than as the name of the duration itself. Consequently,
the slices in the Perfetto visualization will all say
"handle_input_event", and we'll need to select a slice to get the
details of which handler was running.

The challenge here is that (for technical reasons), using the
`handler_name` as the duration's name would require adding
`unsafe` code. If the indirection to get to the handler's name
in the Perfetto UI turns out to be an impediment to analyzing
traces, we can reconsider.

While there
-----------
Update an error message in the `Task` created by `add_handler()`, to
provide more detailed information on the affected `InputHandler`.

Manual test
-----------
1. Flash onto an Atlas.
2. Capture trace of using the touchpad.
3. Open trace at ui.perfetto.dev
4. Share trace as https://ui.perfetto.dev/#!/?s=9b81418ca3d1448be6c6902c4e296683f2f8f9437508131a2db81fcbe7

Original-Bug: 110679
Test: fx test input_pipeline_lib_tests and manual (see above)
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/732062
Original-Revision: 06b583d60ffe3d59189055f510109a7c159bbf42
GitOrigin-RevId: 18ee70fa4178fce3c03ae0bb33403b76f8af2860
Change-Id: I0d5d3d9928dc917925e828eb97c2a2d3534088b1