Add more tests for AirPods data decryption

This commit adds a test case to `AirPodsProTest` to verify the decryption of AirPods Pro data with and without encryption/IRK keys. It also introduces a new test class `RPACheckerTest` to validate the RPA checking mechanism.

Helper functions for converting hex strings to byte arrays and setting mock keys have been added to `BaseAirPodsTest` to simplify test setup.

app-common/src/main/java/eu/darken/capod/pods/core/apple/AppleFactory.kt

@@ -58,10 +58,10 @@ class AppleFactory @Inject constructor(
 
     suspend fun create(scanResult: BleScanResult): PodDevice? = lock.withLock {
         val proximityMessage = getMessage(scanResult) ?: return@withLock null
+        val payload = getPayload(scanResult, proximityMessage)
 
         val factory = podFactories.firstOrNull { it.isResponsible(proximityMessage) }
 
-        val payload = getPayload(scanResult, proximityMessage)
 
         return@withLock (factory ?: unknownAppleFactory).create(
             scanResult = scanResult,

app-common/src/main/java/eu/darken/capod/pods/core/apple/airpods/AirPodsGen1.kt

@@ -42,7 +42,6 @@ data class AirPodsGen1(
             getModelInfo().full == DEVICE_CODE && length == ProximityPairing.PAIRING_MESSAGE_LENGTH
         }
 
-
         override fun create(
             scanResult: BleScanResult,
             payload: ProximityPayload