Added sample for DLP : de-identify sensitive data with a simple word list

[sameer-crest]

Added sample for de-identify sensitive data with a simple word list
Added 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.

You are about to add 1 region tag.

• dlp/src/deidentify_simple_word_list.php:27, tag dlp_deidentify_simple_word_list

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