[MySQL][TSDB] Add metric type mapping for performance datastream

[agithomas]

Type of change

• Enhancement

What does this PR do?

Add metric_type mapping for Performance datastream of MySQL

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

• Install / upgrade the integration package
• Verify the data in dashboard and in discover view.

Related issues

• Relates MySQL TSDB Enablement #5277

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• Start Time: 2023-03-16T09:04:07.894+0000

• Duration: 32 min 6 sec

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Passed	74
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Total	74

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	85.714% (24/28)	❕
Lines	93.706% (134/143)	❕
Conditionals	100.0% (0/0)	💚

[ritalwar]

LGTM!

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Package mysql - 1.7.0 containing this change is available at https://epr.elastic.co/search?package=mysql