[Azure Logs] Add recommendations for event hub configuration

[zmoog]

What does this PR do?

Currently, Elastic Agent collects Azure logs running Filebeat behind the scenes. The current Filebeat implementation design requires using one event hub for each log type and today's Filebeat documentation reports that.

This PR adds the same Event Hub configuration recommendations for Azure Logs integrations.

I am adding this information because multiple people have asked this question lately.

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.

[elasticmachine]

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• Start Time: 2022-07-22T10:48:40.999+0000

• Duration: 14 min 0 sec

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Test	Results
Failed	0
Passed	105
Skipped	0
Total	105

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (7/7)	💚
Files	81.25% (13/16)	👎 -15.809
Classes	81.25% (13/16)	👎 -15.809
Methods	80.451% (107/133)	👎 -9.082
Lines	81.826% (1855/2267)	👎 -8.757
Conditionals	100.0% (0/0)	💚

[tommyers-elastic]

Thanks for this!