[IIS] Add dimension field mapping for webserver datastream to support…

[ritalwar]

• Enhancement

What does this PR do?

This PR adds dimension field mapping for web server data stream of IIS to support TSDB enablement.

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.

Related issues

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• Start Time: 2023-06-15T17:56:10.227+0000

• Duration: 14 min 59 sec

Test stats 🧪

Test	Results
Failed	0
Passed	29
Skipped	0
Total	29

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	85.714% (30/35)	❕
Lines	93.772% (271/289)	❕
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

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💚 Build Succeeded

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• Commit: 9b15db9

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Package iis - 1.12.1 containing this change is available at https://epr.elastic.co/search?package=iis