fix: make grid renderer arguments required

[tomivirkki]

It shouldn't be possible for the grid body renderer not to have a defined model. The current typings require you to either check for the model:

private renderer: GridBodyRenderer<Person> = (root, _column, model) => {
  root.textContent = model ? model.item.lastName : '';
};

or use non-null assertion:

private renderer: GridBodyRenderer<Person> = (root, _column, model) => {
  root.textContent = model!.item.lastName;
};

[sonarcloud]

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