[couchbase] Add dimension mapping to bucket datastream

[agithomas]

• Enhancement

What does this PR do?

Add dimensions to bucket datastream

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

1. Build verification
   elastic-package build
elastic-package stack up -v -d --services package-registry
2. Document count verification after enablement
3. Dashboard verification after enablement
4. Index template verification
5. Index mapping verification
6. Index settings verification.

Related issues

• Relates [Couchbase] TSDB Enablement #7378

Screenshots

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-08-22T06:29:22.110+0000

• Duration: 28 min 59 sec

Test stats 🧪

Test	Results
Failed	0
Passed	45
Skipped	0
Total	45

🤖 GitHub comments

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[agithomas]

Disablement testing

{
  "acknowledged": true,
  "shards_acknowledged": true,
  "old_index": ".ds-metrics-couchbase.bucket-default-2023.08.16-000001",
  "new_index": ".ds-metrics-couchbase.bucket-default-2023.08.16-000002",
  "rolled_over": true,
  "dry_run": false,
  "conditions": {}
}

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (10/10)	💚
Files	100.0% (10/10)	💚 3.371
Classes	100.0% (10/10)	💚 3.371
Methods	100.0% (72/72)	💚 8.172
Lines	100.0% (1076/1076)	💚 11.661
Conditionals	100.0% (0/0)	💚

[ritalwar]

LGTM!

[agithomas]

/test

[elasticmachine]

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