CI - (mbed-os): Add workflow to analyse bin & map files when upgrading mbed-os

[ladislas]

When upgrading mbed os, the following workflow does the following:

• build LekaOS, spikes, tests, libs & drivers with the current and the
  upgrade version
• compare bin files to spot differences
• compare memmap output to highlight size differences

The workflow does not check if "it works", it just tells where the
differences are so that a team meber can investigate further

[codecov]

Codecov Report

Merging #189 (eb729db) into develop (8b86bda) will not change coverage.
The diff coverage is n/a.

❗ Current head eb729db differs from pull request most recent head fe9990c. Consider uploading reports for the commit fe9990c to get more accurate results

@@            Coverage Diff            @@
##           develop      #189   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          215       215           
=========================================
  Hits           215       215           

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[codeclimate]

Code Climate has analyzed commit fe9990c and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

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