DLP: Added sample for deidentify using simple word list (#3137)

[annadata]

• Added sample for deidentify_simple_word_list Added unit test cases
• Updated 'de-identify' to be consistent everywhere
• Reference: https://cloud.google.com/dlp/docs/samples/dlp-deidentify-simple-word-list
• These changes were reviewed on DLP: Added sample for deidentify using simple word list #3099
• Sending PR from branch as workaround to CI failures.

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[kweinmeister]

We can close this PR now that the other PR was merged @annadata ?

[kweinmeister]

Will go ahead and close, please re-open if needed.