Add conditional edit operator syntax (SYN-7486)

[Cisphyx]

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[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.42%. Comparing base (5517cfb) to head (ab8bd7a).

Files with missing lines	Patch %	Lines
synapse/lib/ast.py	96.72%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4046      +/-   ##
==========================================
- Coverage   96.50%   96.42%   -0.08%     
==========================================
  Files         254      254              
  Lines       59602    59663      +61     
==========================================
+ Hits        57517    57531      +14     
- Misses       2085     2132      +47     

Flag	Coverage Δ
linux	96.42% <96.96%> (-0.01%)	⬇️
linux_replay	?

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