refactor: move connecting state logic into proper methods

[arthurschreiber]

This moves the logic that lived in the connection state machine into proper methods.

[codecov]

Codecov Report

Attention: Patch coverage is 61.72840% with 62 lines in your changes missing coverage. Please review.

Project coverage is 85.47%. Comparing base (aa0f183) to head (7ba5ddb).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/connection.ts	61.72%	61 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1661   +/-   ##
=======================================
  Coverage   85.46%   85.47%           
=======================================
  Files          90       90           
  Lines        4857     4859    +2     
  Branches      924      924           
=======================================
+ Hits         4151     4153    +2     
  Misses        702      702           
  Partials        4        4           

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