Use synchronous answering machine detection on Twilio channels

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #485 (a642841) into main (3f0c73e) will increase coverage by 0.05%.
The diff coverage is 3.70%.

@@            Coverage Diff             @@
##             main     #485      +/-   ##
==========================================
+ Coverage   56.83%   56.88%   +0.05%     
==========================================
  Files         123      123              
  Lines        8622     8614       -8     
==========================================
  Hits         4900     4900              
+ Misses       2945     2937       -8     
  Partials      777      777              

Impacted Files	Coverage Δ
core/ivr/twiml/twiml.go	18.88% <0.00%> (+0.31%)	⬆️
core/ivr/vonage/vonage.go	20.22% <0.00%> (-0.05%)	⬇️
web/ivr/ivr.go	46.03% <5.55%> (+1.18%)	⬆️

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