Add edge trigger conditions, resolves SYN-6974

[rakuy0]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2c5fbd7) 97.36% compared to head (a80d3c2) 97.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3389      +/-   ##
==========================================
- Coverage   97.36%   97.27%   -0.09%     
==========================================
  Files         233      233              
  Lines       47727    47892     +165     
==========================================
+ Hits        46469    46587     +118     
- Misses       1258     1305      +47     

Flag	Coverage Δ
linux	97.27% <99.40%> (+<0.01%)	⬆️
linux_replay	?

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Files	Coverage Δ
synapse/lib/cache.py	100.00% <100.00%> (ø)
synapse/lib/snap.py	96.01% <100.00%> (+0.03%)	⬆️
synapse/lib/storm.py	95.71% <ø> (ø)
synapse/lib/stormtypes.py	98.83% <100.00%> (+<0.01%)	⬆️
synapse/lib/view.py	97.22% <100.00%> (-0.27%)	⬇️
synapse/models/syn.py	98.41% <ø> (ø)
synapse/lib/trigger.py	96.41% <99.23%> (+0.99%)	⬆️

... and 7 files with indirect coverage changes

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