Add @Monster annotation and run these tests periodically [LUCENE-5606]

We have some awesome very heavy tests, Test2B\*, but they are `@Ignored` and we never run them. I think we should add a new `@Monster` annotation and set up a Jenkins job with huge test timeout, big Java heap, etc.?

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Migrated from [LUCENE-5606](https://issues.apache.org/jira/browse/LUCENE-5606) by Michael McCandless (@mikemccand), updated Apr 16 2014
Attachments: [LUCENE-5606.patch](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-5606/LUCENE-5606.patch)

Start with the ignored Test2B* tests and the attached LUCENE-5606.patch, then inspect how Lucene currently marks tests and configures Jenkins jobs. Define the @Monster annotation and periodic Jenkins execution with the required timeout and heap settings; done means the heavy tests run in that job without affecting ordinary test runs.

Written by the indexing model from the issue text.