add option to handle nested objects EPD-1473

[anoonan]

This PR will allow you to map your traits/properties in your Segment <> Intercom UI settings whereby you can tell us which property/trait you'd like us to stringify, flatten, or drop. You can also now set a default method to handle nested objects.

logic:

• did you blacklist a trait?

  -If yes, how would you like the trait to be handled: dropped, flattened, or stringified -If no, the default method that the customer has selected will handle the nested trait. (the default method will be set to 'flatten' because that is how we are currently handling nested objects on the server side.)

server side PR: https://github.com/segment-integrations/integration-intercom/pull/41

TODO:

• [x] site-docs
• [x] metadata
• [x] deploy

[codecov-io]

Codecov Report

Merging #20 into master will increase coverage by 0.44%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #20      +/-   ##
=========================================
+ Coverage   98.76%   99.2%   +0.44%     
=========================================
  Files           1       1              
  Lines          81     126      +45     
=========================================
+ Hits           80     125      +45     
  Misses          1       1

Impacted Files	Coverage Δ
lib/index.js	99.2% <100%> (+0.44%)	:white_check_mark:

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[hankim813]

LGTM after recent changes!