Added metric_type fields for metrics datastream.

[ritalwar]

• Enhancement

What does this PR do?

This PR adds metric_type for the fields of metrics data stream of mongoldb.

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 MongoDB TSDB Enablement #5281

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• Start Time: 2023-05-20T17:50:31.284+0000

• Duration: 18 min 51 sec

Test stats 🧪

Test	Results
Failed	0
Passed	24
Skipped	0
Total	24

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (3/3)	💚 3.022
Classes	100.0% (3/3)	💚 3.022
Methods	96.97% (32/33)	👍 5.25
Lines	68.217% (88/129)	👎 -23.782
Conditionals	100.0% (0/0)	💚

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (3/3)	💚 2.866
Classes	100.0% (3/3)	💚 2.866
Methods	96.97% (32/33)	👍 4.421
Lines	68.217% (88/129)	👎 -23.764
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[ritalwar]

/test

[elasticmachine]

Package mongodb - 1.9.5 containing this change is available at https://epr.elastic.co/search?package=mongodb