Implement telemetry memory

[jeromehue]

Description

• Add a new TelemetryRecord struct holding the telemetry variables.
• Add methods to store and load a telemetry record.
• Add a FramRingArray of TelemetryRecords telemetryMemory variable.
• Add a function to gather telemetry data, incomplete for now as all the topics/persistent variable have not been implemented yet.

Added files : TelemetryMemory.hpp, TelemetryMemory.cpp.

Fixes #179
Fixes parts of #198

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.98%. Comparing base (c1ffc6b) to head (e27ad2d).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #344   +/-   ##
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  Coverage   81.98%   81.98%           
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  Files          49       49           
  Lines        1782     1782           
  Branches       77       77           
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  Hits         1461     1461           
  Misses        321      321           

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