Add "revs" definition to allow reverse relationship mapping in STIX export config

[invisig0th]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10 ⚠️

Comparison is base (aed53c0) 97.30% compared to head (59c0b32) 97.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3137      +/-   ##
==========================================
- Coverage   97.30%   97.20%   -0.10%     
==========================================
  Files         222      222              
  Lines       44292    44302      +10     
==========================================
- Hits        43098    43064      -34     
- Misses       1194     1238      +44     

Flag	Coverage Δ
linux	97.20% <100.00%> (+<0.01%)	⬆️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/models/risk.py	100.00% <ø> (ø)
synapse/lib/stormlib/stix.py	99.13% <100.00%> (+0.02%)	⬆️

... and 9 files with indirect coverage changes

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