Channel Event OptIn ID

[rowanseymour]

• RP backend now extracts optin id from extra and saves as actual id in the database
• Change extra fields on optin/optout events to be more consistent with other FB/IG events
• Enforce extra being map[string]string as this avoids problems if an event is spooled to JSON and reloaded (ints become floats)

[codecov]

Codecov Report

Merging #652 (ceab9b0) into main (0786149) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #652      +/-   ##
==========================================
+ Coverage   74.24%   74.32%   +0.07%     
==========================================
  Files          99       99              
  Lines       13147    13136      -11     
==========================================
+ Hits         9761     9763       +2     
+ Misses       2697     2685      -12     
+ Partials      689      688       -1     

Files	Coverage Δ
backends/rapidpro/channel_event.go	50.86% <100.00%> (+2.68%)	⬆️
handlers/facebook_legacy/handler.go	84.37% <100.00%> (-0.22%)	⬇️
handlers/meta/handlers.go	84.76% <100.00%> (+0.12%)	⬆️
handlers/test.go	0.00% <ø> (ø)
responses.go	79.71% <ø> (ø)

... and 1 file with indirect coverage changes

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