OPENNLP-1665 - Implement TokenizerService and SentenceDetectorService

[rzo1]

Thank you for contributing to Apache OpenNLP.

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to ensure the following steps have been taken:

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

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For documentation related changes:

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Note:

• Implement TokenizerService and SentenceDetectorService.
• Reduces code duplication for multiple service by using default interface methods
• Adds Unit and Integration Tests
• Regenerate documentation and updates README

[rzo1]

Thanks for the reviews. I am going to integrate it, so we can proceed with additional improvements (missing default components, docker support, ...)