[M3RSM] Implementation of basic classes#1

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LucasJSch wants to merge 3 commits intoekumenlabs:foxy-develfrom

LucasJSch:foxy-devel

Commits on Oct 7, 2021

[M3RSM] Add docker build structure + gitignore update.
LucasJSch
committed
[M3RSM] Adding gtest files for unit tests.
LucasJSch
committed
[M3RSM] First implementation of MockLookupTable and LookupTableManager.
LucasJSch
committed