[activemq] Add ECS fields

[kush-elastic]

• Enhancement

What does this PR do?

This pull request is raised to add some ECS fields to ActiveMQ package which could be useful for user experience. Following changes are made to enhance package.

• Added event.category
• Added event.kind
• Added event.type
• Updated ecs.yml with all the fields
• Updated version to 0.4.3 in manifest.yml

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

• Clone integrations repo.
• Install elastic-package locally.
• Start elastic stack using elastic-package.
• Move to integrations/packages/activemq directory.
• Run the following command to run tests.

[elasticmachine]

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Build stats

• Start Time: 2022-09-15T11:27:55.354+0000

• Duration: 19 min 22 sec

Test stats 🧪

Test	Results
Failed	0
Passed	26
Skipped	0
Total	26

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚 2.597
Classes	100.0% (2/2)	💚 2.597
Methods	95.833% (23/24)	👍 6.838
Lines	85.321% (93/109)	👎 -5.108
Conditionals	100.0% (0/0)	💚

[ishleenk17]

Looks good!

[ishleenk17]

Looks good!