Create a Mock Broker

[NickMcSweeney]

Create Mock Broker

Allows for testing interface function behavior.

Config changes make for better integration with MQTT.jl interface package (soon to be released)

Changes

• created Mock Broker function
• changed MQTTConnection to Connection
• add a Configuration object containing Client and Connection
• add a abstract type for Client and Connection
• add integration tests with mock broker
• update documentation

[codecov]

Codecov Report

Attention: Patch coverage is 93.15068% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 85.11%. Comparing base (4ebb3af) to head (e677738).
Report is 13 commits behind head on main.

❗ Current head e677738 differs from pull request most recent head d71bdd2

Please upload reports for the commit d71bdd2 to get more accurate results.

Files	Patch %	Lines
src/connection.jl	54.54%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   91.02%   85.11%   -5.92%     
==========================================
  Files           7        8       +1     
  Lines         323      497     +174     
==========================================
+ Hits          294      423     +129     
- Misses         29       74      +45     

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