add query command for service data

[gruebel]

What does this PR do?

• this adds a new query sub-command service-table
• also added for this specific output a csv format variant

Fixes #475

ex.

$ policy_sentry query service-table --fmt csv

prefix,service_name
a4b,Alexa for Business
execute-api,Amazon API Gateway
apigateway,Amazon API Gateway Management
...

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Completion checklist

• Additions and changes have unit tests
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