[cisco_umbrella] Enrich DNS fields

[LaZyDK]

What does this PR do?

Enriches the dns fields from dns.question.name to dns.question.registered_domain, dns.question.top_level_domain and dns.question.sudomain.

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.

Author's Checklist

• Review that enrichment is happening

Related issues

[LaZyDK]

@P1llus Please see if this works before merging.

[elasticmachine]

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• Start Time: 2022-07-14T20:22:27.073+0000

• Duration: 16 min 18 sec

Test stats 🧪

Test	Results
Failed	0
Passed	8
Skipped	0
Total	8

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[elasticmachine]

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

[andrewkroh]

/test

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.049
Classes	100.0% (1/1)	💚 3.049
Methods	94.444% (17/18)	👍 5.359
Lines	92.837% (324/349)	👍 2.631
Conditionals	100.0% (0/0)	💚

[andrewkroh]

/test