Add metric_type mapping for the fields of proxy dataset.

[ritalwar]

Proposed commit message

This PR adds the metric_type mapping for the fields of proxy datastream of Redis Enterprise.

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 [Redis Enterprise] TSDB Enablement #6268

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• Start Time: 2023-11-27T10:32:21.271+0000

• Duration: 15 min 17 sec

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Passed	5
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Total	5

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 77.778
Classes	100.0% (0/0)	💚 77.778
Methods	50.0% (4/8)	👍 16.667
Lines	100.0% (0/0)	💚 76.993
Conditionals	100.0% (0/0)	💚

[harnish-elastic]

LGTM!

[agithomas]

LGTM!

[elasticmachine]

Package redisenterprise - 0.8.3 containing this change is available at https://epr.elastic.co/search?package=redisenterprise