Add dimension fields to support TSDB enablement

[ritalwar]

• Enhancement

What does this PR do?

• TSDB Enablement for Cockroachdb.

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.

How to test this PR locally

Download, Install, configure cockroachdb
Configure the cockroachdb integration
Verify the dashboard is loaded correctly without missing data except panels reporting errors.

Related issues

• Relates CockroachDb TSDB Enablement #5410

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2023-03-21T06:43:51.798+0000

• Duration: 15 min 26 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4
Skipped	0
Total	4

🤖 GitHub comments

Expand to view the GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	75.0% (3/4)	❕
Lines	100.0% (0/0)	💚
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[elasticmachine]

Package cockroachdb - 1.2.0 containing this change is available at https://epr.elastic.co/search?package=cockroachdb