RxJavaHooks.enableAssemblyTracking() breaks error handling

[artem-zinnatullin]

Problem:

If user enables assembly tracking then ALL exceptions get wrapped into AssemblyStackTraceException which breaks all error handling code that expects particular exceptions.

Solution:

Do not change type of original exception and modify its stacktrace directly. I'll work on that soon, both for 1.x and 2.x.

// Spent an hour today trying to figure out what was causing app misbehave, glad we have git bisect, was very surprised to see commit where I enabled assembly tracking…

[akarnokd]

Yeah, in Java 8 I simply add it as a suppressed exception. In Java 8, you have to find an unused slot of cause in a potentially complicated graph of exceptions and composites.

[pyricau]

This change likely caused #4737