Add GET /connections

[jthodge]

This PR introduces the following changes:

• Adds functionality to retrieve a list of Connections using the WorkOS SSO REST API

[linear]

SDK-21 Add "GET /connections" for Python SDK

[codecov-io]

Codecov Report

Merging #51 (92c8503) into master (ea72f62) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   94.75%   94.75%           
=======================================
  Files          14       14           
  Lines         286      286           
=======================================
  Hits          271      271           
  Misses         15       15           

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