OPENNLP-1653 Add thread-safe version of LemmatizerME

[mawiesne]

Tasks

Thank you for contributing to Apache OpenNLP.

In order to streamline the review of the contribution we ask you
to ensure the following steps have been taken:

For all changes:

• Is there a JIRA ticket associated with this PR? Is it referenced
  in the commit message?

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Note:

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