Incorrect Characteristic equality for DiscoveredCharacteristic

[twyatt]

On Android at least (have not checked for the other platforms) the equality check of DiscoveredCharacteristic may be incorrect if the list of descriptors is non-empty:

kable/core/src/commonMain/kotlin/Characteristic.kt

Lines 24 to 28 in 5d6e00e

	public data class DiscoveredCharacteristic internal constructor(
	override val serviceUuid: Uuid,
	override val characteristicUuid: Uuid,
	public val descriptors: List<Descriptor>,
	) : Characteristic

This is because the equality of a DiscoveredCharacteristic will be checked against it's list of descriptors, and on Android the BluetoothGattDescriptor object does not provide an equals function. So, if we have two descriptor objects in memory that represent the same descriptor on a peripheral, then they will erroneously be seen as not equal.

In most cases this will not be an issue, but the Observers class relies on the correctness of Characteristic equality.

[twyatt]

More specifically, the following code should take into account instanceId on Android:

kable/core/src/commonMain/kotlin/ObservationEvent.kt

Lines 18 to 20 in 260f0cd

	internal fun <T> ObservationEvent<T>.isAssociatedWith(characteristic: Characteristic): Boolean =
	this.characteristic.characteristicUuid == characteristic.characteristicUuid &&
	this.characteristic.serviceUuid == characteristic.serviceUuid