💾 Internal change: Use OptionSet paradigm for flags of WeightScaleService

[nriedman]

Problem

Right now, the WeightScaleService's characteristics decode the flag bits by manually bit shifting and masking. In other parts of SpeziBluetooth, we utilize and OptionSet to recover the flags. This technique makes for cleaner code.

Solution

Instead of bit shifting and bit masking, we use an OptionSet to decode all the flags from a UInt8 rawValue at once.

Additional context

No response

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