Allow users to specify the exceptions to retrieve

[julianharty]

We sometimes want to focus on a subset of the exceptions e.g.

• to retrieve the crash clusters for a JNI exception.
• to retrieve only the NPE's
• to retrieve crashes for a particular class or method

Example of the JNI crash cluster

java.lang.UnsatisfiedLinkError
in org.kiwix.kiwixlib.JNIKiwix.<clinit>

Example of specific Exception where we might want to retrieve crashes for contentQuery

java.lang.IllegalArgumentException
in org.kiwix.kiwixmobile.utils.files.FileUtils.contentQuery

The methods may be obfuscated or in full (see screenshots below)

[ISNIT0]

I would implement this by adding a --exceptionFilter= and --classFilter. The values of which would be passed into downloader.getCrashClusterIds from index.ts