New rule: NoMandatoryConstructorInExceptionClass

[dykov]

Description

A new rule has been implemented to check if an exception class has constructors with required signature:
public Ctor(Throwable, String, Object...) or public Ctor(String, Object...)

class MyException extends Exception {
    public MyException(String pattern, Object... args) {}

    public MyException(Throwable cause, String pattern, Object... args) {}
}

Completed work

• Added new rule
• Added new unit tests
• Passed all checks

Related issues:

Implements #3

[dgroup]

@rultor merge

[rultor]

@rultor merge

@dgroup OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@dgroup Done! FYI, the full log is here (took me 2min)