DLP: Added sample for deidentify using simple word list

[dinesh-crest]

Added sample for DeIdentify using a custom simple word list
Added unit test cases for the same

Reference: https://cloud.google.com/dlp/docs/samples/dlp-deidentify-simple-word-list

[snippet-bot]

Here is the summary of changes.

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• dlp/deIdentifyWithSimpleWordList.js:25, tag dlp_deidentify_simple_word_list

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[annadata]

Already reviewed on #3099
Trying to use branch to see if tests run.

[annadata]

Already reviewed on #3099 Trying to use branch to see if tests run.

Please ignore this. Wrong tab!