Support for dynamic message menu options inside dialogs, and new within constraint

[aoberoi]

Summary

For options requests, you can now set the within constraint to either 'interactive_message' or 'dialog' in order to attach a handler that is specific to those contexts.

Requirements (place an x in each [ ])

• [x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.

[codecov[bot]]

Codecov Report

Merging #36 into master will increase coverage by 0.04%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
+ Coverage   99.41%   99.45%   +0.04%     
==========================================
  Files           3        3              
  Lines         170      185      +15     
==========================================
+ Hits          169      184      +15     
  Misses          1        1

Impacted Files	Coverage Δ
src/adapter.js	99.25% <100%> (+0.09%)	:arrow_up:

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