[Vsphere] Add dimensions field mapping for host datastream to suppo…

[ritalwar]

• Enhancement

What does this PR do?

This PR adds dimension field mapping for Vsphere host data stream 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

• Relates [Vsphere] TSDB Enablement #6266

[elasticmachine]

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• Start Time: 2023-06-01T05:35:37.020+0000

• Duration: 16 min 59 sec

Test stats 🧪

Test	Results
Failed	0
Passed	17
Skipped	0
Total	17

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	100.0% (18/18)	💚
Lines	89.13% (41/46)	👎 -4.685
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[elasticmachine]

Package vsphere - 1.7.1 containing this change is available at https://epr.elastic.co/search?package=vsphere