Add an option to remove PyTorch if not needed

[LexABzH]

Problem

All templates are generated with PyTorch. It tends to add a lot of useless complexity for projects that does not need PyTorch.

Concerned template

• [ ] NLP template
• [ ] NUM template
• [ ] VISION template
• [x] How templates are generated - Jinja

Solution

• MVP: Add an option with Jinja to not add PyTorch if not wanted.

There will be a lot of things to change, including all tests. This might be tough ! This also might add an important reading complexity in template files.

Additional context

This might be complicated to test. We should test all possibilities. Cf. workflow actions.

Related to Issue #20 #21

[LexABzH]

We should wait for https://github.com/OSS-Pole-Emploi/gabarit/issues/53 to be resolved first