[proofpoint_tap] Add Proofpoint TAP package

[darshan-elastic]

What does this PR do?

• Generated the skeleton of the Proofpoint TAP integration package.
• Added a data stream.
• Added data collection logic to the data stream.
• Added the ingest pipeline for the data stream.
• Mapped fields according to the ECS schema and added Fields metadata in the appropriate yml files
• Added dashboards and visualizations.
• Added test for pipeline for the data stream.
• Added system test cases for the data stream.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

How to test this PR locally

• Clone integrations repo.
• Install elastic-package locally.
• Start elastic stack using elastic-package.
• Move to integrations/packages/proofpoint_tap directory.
• Run the following command to run tests.
  elastic-package test

Related issues

• Proofpoint Targeted Attack Protection (TAP) #2464

Screenshots

[darshan-elastic]

/test

[elasticmachine]

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Build stats

• Start Time: 2022-05-18T13:24:44.361+0000

• Duration: 18 min 46 sec

Test stats 🧪

Test	Results
Failed	0
Passed	53
Skipped	0
Total	53

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	100.0% (4/4)	💚 3.589
Classes	100.0% (4/4)	💚 3.589
Methods	100.0% (62/62)	💚 11.711
Lines	98.179% (1078/1098)	👍 9.161
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[darshan-elastic]

@jamiehynds @andrewkroh This integration has been tested using a mock server.

[darshan-elastic]

/test

[andrewkroh]

event.created is missing a definition in the fields files.

--- Test results for package: proofpoint_tap - START ---
FAILURE DETAILS:
proofpoint_tap/clicks_blocked Verify sample_event.json:
[0] field "event.created" is undefined
proofpoint_tap/clicks_permitted Verify sample_event.json:
[0] field "event.created" is undefined
proofpoint_tap/message_blocked Verify sample_event.json:
[0] field "event.created" is undefined
proofpoint_tap/message_delivered Verify sample_event.json:
[0] field "event.created" is undefined