[Checkpoint] Include sequencenum for checkpoint fingerprint

[gogochan]

Proposed commit message

From Checkpoint admin guide

loguid - Some Check Point logs are updated over time. Updated logs have the same loguid value. Check Point SmartLog client correlates those updates into a single unified log. When the update logs are sent to 3rd party servers, they arrive as distinct logs.

It is possible for multiple log entries to share the existing attributes as it was shown in https://github.com/elastic/sdh-beats/issues/5556, hence adding sequencenum to calculate the fingerprint.

Also adding additional missing fields.

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• I have reviewed tips for building integrations and this pull request is aligned with them.
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• I have added an entry to my package's changelog.yml file.
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96.2% Coverage on New Code
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