[O11y][Apache Spark] Add metric_type for application data stream

[harnish-elastic]

• Enhancement

What does this PR do?

This PR adds metric_type mapping for the fields of the application data stream.

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.

To verify the metric_type, please refer to the below mbeans type that is used for data collection

  - mbean: 'metrics:name=application.*.runtime_ms,type=gauges'
    attributes:
    - attr: Value
      field: application.runtime.ms
  - mbean: 'metrics:name=application.*.cores,type=gauges'
    attributes:
    - attr: Value
      field: application.cores

• Relates Apache Spark TSDB Enablement #7786
• Relates [O11y][Apache Spark] Add metric_type across package #7408

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• Start Time: 2023-10-12T11:30:20.944+0000

• Duration: 20 min 36 sec

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[aliabbas-elastic]

LGTM

[agithomas]

LGTM!

[elasticmachine]

Package apache_spark - 0.7.1 containing this change is available at https://epr.elastic.co/search?package=apache_spark