Added change notes for AndroidManifest.qll

Author: egregius313

java/ql/lib/change-notes/2022-10-17-android-activity-alias.md

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+---
+category: minorAnalysis
+---
+* Added the `AndroidActivityAliasXmlElement` class to represent `<activity-alias>` components in Android manifests.
+* Added the `AndroidActivityXmlElement.getAnAlias` method to get the aliases of an `<activity>` element in an Android manifest.
+* Added the `AndroidIdentifierXmlAttribute` class to represent XML attributes representing component identifiers, such as `android:name` and `android:targetActivity`
+* Added the `AndroidComponentXmlElement.getResolvedIdentifier` method, for finding the fully qualified identifier from an identifier.
+* Added the `AndroidComponentXmlElement.getResolvedComponentName` method, for finding the fully qualified identifier of a component.