[Vsphere] Add dimensions field mapping for datastore datastream to support TSDB.

[ritalwar]

• Enhancement

What does this PR do?

This PR adds dimension fields mapping for datastore data stream of Sphere 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: 2023-05-30T15:42:19.488+0000

• Duration: 17 min 17 sec

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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)	💚 5.882
Lines	89.13% (41/46)	👎 -4.372
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[shmsr]

LGTM

[elasticmachine]

Package vsphere - 1.7.0 containing this change is available at https://epr.elastic.co/search?package=vsphere