[RabbitMQ] Added metrictype for rabbitmq exchange datastream.

[ritalwar]

• Enhancement

What does this PR do?

This PR adds metrictype for rabbitmq exchange 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.

• Relates RabbitMQ TSDB Enablement #5279

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• Start Time: 2023-04-04T05:35:01.288+0000

• Duration: 14 min 34 sec

Test stats 🧪

Test	Results
Failed	0
Passed	12
Skipped	0
Total	12

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.298
Classes	100.0% (1/1)	💚 3.298
Methods	70.0% (14/20)	👎 -21.214
Lines	73.913% (34/46)	👎 -17.488
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[elasticmachine]

Package rabbitmq - 1.8.5 containing this change is available at https://epr.elastic.co/search?package=rabbitmq