Add moabb.run as installed script

[v-goncharenko]

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poetry is able to install scripts along with python package. see docs and example from poetry itself

We could add moabb.run.py as a script named just moabb, so instead of

python -m moabb.run --pipelines=./moabb/tests/test_pipelines/ --verbose

one will be able to call

moabb --pipelines=./moabb/tests/test_pipelines/ --verbose

[sylvchev]

This is a good idea. The run.py is already part of the unit tests and it could really help to set up an automatic benchmark.