Improve classNowCheckedException accuracy

[lmove]

To detect the classNowCheckedException we have the following specification:

• Consider concrete subtypes of the modified class affected by the change.
• Report on client methods.
• An affected method throws and creates an instance of the now checked exception.
• An affected method does not include the exception in the throws declaration.

With M3 we only have access to information related to the exception initialization. Information related to checked and thrown exceptions is missing, even though it is available in the bytecode. We need to check alternatives to correctly report this issue. Some options are using flybytes and adding the exceptions relation to `M3'.

Without this solution we can have an approximation where we report on client methods that call the constructors of the now checked exception.