Introduce & run `make format`

[vincentmr]

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Title:

Summary: Add make format (isort + black). Run make format.

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[josh146]

Hey @vincentmr! we have chosen not to isort and format the demos/tutorials, for a couple of reasons:

• Black will make formatting choices that are not always the best for readability
• isort will reorder imports in a way that is not always best for explanation (sometimes we want to import things later in the demo)

unless there is a motivation for doing this in the QML repo, I will close this PR for now.

[vincentmr]

Hey @vincentmr! we have chosen not to isort and format the demos/tutorials, for a couple of reasons:

• Black will make formatting choices that are not always the best for readability

Being so used to read black-formatted code, I thought it might help readability in general, but I agree this could make things worse on some cases.

• isort will reorder imports in a way that is not always best for explanation (sometimes we want to import things later in the demo)

Yes, good point.

unless there is a motivation for doing this in the QML repo, I will close this PR for now.

No problem.