[16.0] stock_packaging_calculator: computation will hang on very large quantities

[MartinAavastik]

Module stock_packaging_calculator

Describe the bug

StockPicking view will hang if the StockMoveLine has very large quantity like 76 000 000.

Problem is with _qty_by_pkg method:

    def _qty_by_pkg(self, pkg_qty, qty):
        """Calculate qty needed for given package qty."""
        qty_per_pkg = 0
        while (
            float_compare(qty - pkg_qty, 0.0, precision_digits=self.uom_id.rounding)
            >= 0.0
        ):
            qty -= pkg_qty
            qty_per_pkg += 1
        return qty_per_pkg, qty

If quantity is very large and pkg_qty is like 1.0, then this will just hang.

To Reproduce

Affected versions:
16

Steps to reproduce the behavior:
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Expected behavior
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Additional context
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