Double dots are still normal in some environments

In previous editions of Javamail, an unquoted local part containing double dots (and I believe leading or trailing dots) was acceptable. Some providers in Japan, such as NTT, still have many users whose addresses contain double dots. In the 2.0.0 release of Jakarta mail, this is no longer allowed and there is no way to override it through non-strict verification.

**To Reproduce**
Steps to reproduce the behavior:
In Java the following will throw an AddressException
InternetAddress ia = new InternetAddress( "a..b@foo.com", true);

**Expected behavior**
There needs to be a way to allow double dots and or leading and or trailing dots to be accepted.
One way to do this would be add a new system property, e.g. "mail.mime.allowdoubledots" and modify the
logic to respect that property.

Start at the InternetAddress validation path shown in the reproduction and trace how strict verification rejects local parts with double, leading, or trailing dots. Determine how an opt-in system property should affect that validation while preserving the current default behavior. Done means the property allows the reported addresses and the Java reproduction no longer throws when it is enabled.

Written by the indexing model from the issue text.