[apache_tomcat_otel] Add Apache Tomcat OpenTelemetry Assets

[ritalwar]

Proposed commit message

This PR adds Apache Tomcat Otel content pack which include assets like dashboards, alert_rule_templates and slo_template.

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

How to test this PR locally

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Vale Linting Results

Summary: 5 warnings found

⚠️ Warnings (5)

File	Line	Rule	Message
packages/apache_tomcat_otel/docs/README.md	5	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'using' instead of 'via'.
packages/apache_tomcat_otel/docs/README.md	58	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'for example' instead of 'e.g'.
packages/apache_tomcat_otel/docs/README.md	59	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'for example' instead of 'e.g'.
packages/apache_tomcat_otel/docs/README.md	60	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'for example' instead of 'e.g'.
packages/apache_tomcat_otel/docs/README.md	61	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'using' instead of 'via'.

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cc @ritalwar