pcap-metadata: add capture/file attributes, hashes, metrics, and bump version

[adulau]

Motivation

• Enrich pcap-metadata to capture more detailed information about packet captures for improved analysis and triage.
• Provide common file-level metadata and checksum attributes to support integrity checks and tooling integrations.
• Expose capture metrics and environment details to aid filtering, reporting, and automated processing.

Description

• Added multiple new attributes to pcap-metadata including capture-application, capture-filter, capture-hardware, capture-operating-system, captured-packets, displayed-packets, dropped-packets, elapsed-time, encapsulation, file-format, file-hash-md5, file-hash-ripemd160, file-hash-sha1, file-hash-sha256, file-name, file-size-in-bytes, marked-packets, packet-size-limit, and time-span-seconds with appropriate misp-attribute types and ui-priority settings.
• Added sane defaults for capture-application and kept/extended existing protocol sane list, and ensured capture-interface, first-packet-seen, last-packet-seen, and text remain available as required alternatives.
• Bumped the schema version from 2 to 3 to reflect the compatibility-changing additions.

Testing

• Ran the project schema validation against the updated objects/pcap-metadata/definition.json and it succeeded.
• Executed the repository's automated unit test suite in CI and all tests passed.

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Codex Task