Add telescope trigger times, move event type to trigger

[maxnoe]

Needed for #1163

This adds per telescope trigger times to the trigger container and fills them in the simtel event source.

It also moves the event type to the trigger information (from index) and removes the telescope_type_id from the index.

[codecov]

Codecov Report

Merging #1322 into master will increase coverage by 0.00%.
The diff coverage is 99.20%.

@@           Coverage Diff           @@
##           master    #1322   +/-   ##
=======================================
  Coverage   90.92%   90.92%           
=======================================
  Files         179      179           
  Lines       12149    12164   +15     
=======================================
+ Hits        11046    11060   +14     
- Misses       1103     1104    +1     

Impacted Files	Coverage Δ
ctapipe/io/toymodel.py	94.44% <ø> (ø)
ctapipe/tools/display_summed_images.py	89.09% <ø> (-1.82%)	⬇️
ctapipe/tools/muon_reconstruction.py	90.98% <ø> (-0.08%)	⬇️
ctapipe/io/simteleventsource.py	94.66% <93.33%> (+0.07%)	⬆️
ctapipe/containers.py	100.00% <100.00%> (ø)
ctapipe/io/eventsource.py	92.95% <100.00%> (ø)
ctapipe/io/tests/test_event_source.py	96.26% <100.00%> (ø)
ctapipe/io/tests/test_simteleventsource.py	100.00% <100.00%> (ø)
ctapipe/tools/display_events_single_tel.py	71.60% <100.00%> (ø)
ctapipe/tools/dump_triggers.py	86.66% <100.00%> (ø)
... and 4 more

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