panw: process URLs for THREAT events of url subtype

[efd6]

What does this PR do?

This processes the PANW URL/Filename (misc) field to either a url object with a uri_parts processor if the type is a THREAT and subtype url. It puts the misc field into file.path or file.name base on a slash heuristic.

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

• [ ]

How to test this PR locally

Related issues

• Closes [PANW] url.original is not parsed #4711

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• Start Time: 2022-12-01T21:20:12.240+0000

• Duration: 18 min 27 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (15/15)	💚 2.265
Classes	100.0% (15/15)	💚 2.265
Methods	98.571% (69/70)	👍 7.28
Lines	93.829% (3269/3484)	👍 1.815
Conditionals	100.0% (0/0)	💚

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

[kcreddy]

Just minor clarification. LGTM 👍🏼

[kcreddy]

LGTM

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Package panw - 3.4.0 containing this change is available at https://epr.elastic.co/search?package=panw