[XM Cyber][Product] Add Product data stream

[muskan-agarwal26]

Proposed commit message

The initial release includes product data stream, associated dashboard and visualizations.

XM Cyber fields are mapped to their corresponding ECS fields where possible.

Test samples were derived from live data samples, which were subsequently sanitized.

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

How to test this PR locally

To test the XM Cyber package:

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

elastic-package test

Related issues

• Relates: [New Integration] XM Cyber #18530

Screenshots

Implementation Details

Default Config Values:

• interval: 24h
• page_size: 100

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Vale Linting Results

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File	Line	Rule	Message
packages/xm_cyber/docs/README.md	193	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

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