Adding 'single_word_only' option to obfuscate processor

[Utkarsh-Aga]

Description

Adding single_word_only configuration option to obfuscate processor. When set to true a word boundary \b is added to the pattern, due to which obfuscation would be applied only to words that are standalone in the input text. By default, it is false, meaning obfuscation patterns are applied to all occurrences.

Issues Resolved

Resolves #4340

Check List

• [X] New functionality includes testing.
• [X] New functionality has a documentation issue. Please link to it in this PR.
  • [ ] New functionality has javadoc added
• [X] Commits are signed with a real name per the DCO

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[Utkarsh-Aga]

Thanks a lot @dlvenable for the review, I have addressed that comment also added a additional unit test testProcessorWithMultiplePatternsWithSingleWordOnly.