DLP: Added sample for de-identification with an exception list

[dinesh-crest]

Added sample for de-identification with an exception list
Added test cases for the same

Reference: https://cloud.google.com/dlp/docs/creating-custom-infotypes-dictionary#exception_list

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• dlp/deIdentifyWithExceptionList.js:25, tag dlp_deidentify_exception_list

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[annadata]

This Node.JS snippet corresponds to existing Java snippet.

[annadata]

LGTM.

[Hugo7825]