implement json expr numbers (SYN-10506)

[OCBender]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.46%. Comparing base (acde827) to head (11c3002).

Additional details and impacted files

@@             Coverage Diff              @@
##           synapse-3xx    #4888   +/-   ##
============================================
  Coverage        96.46%   96.46%           
============================================
  Files              259      259           
  Lines            63060    63061    +1     
============================================
+ Hits             60828    60831    +3     
+ Misses            2232     2230    -2     

Flag	Coverage Δ
linux	96.46% <100.00%> (+<0.01%)	⬆️

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