Added metric_type for fileds of node datastream

[ritalwar]

• Enhancement

What does this PR do?

This PR adds metric_type for fields of node 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.

Related issues

• Relates RabbitMQ TSDB Enablement #5279

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• Start Time: 2023-04-04T05:55:21.484+0000

• Duration: 13 min 48 sec

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Test	Results
Failed	0
Passed	12
Skipped	0
Total	12

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	70.0% (14/20)	👍
Lines	73.913% (34/46)	👍
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[elasticmachine]

Package rabbitmq - 1.8.6 containing this change is available at https://epr.elastic.co/search?package=rabbitmq