Add script to convert CIM to VAST taxonomy

[mavam]

📔 Description

This script makes it possible to convert a splunk CIM datamodel into a VAST taxonomy.

📝 Checklist

• All user-facing changes have changelog entries.
• The changes are reflected on docs.tenzir.com/vast, if necessary.
• The PR description contains instructions for the reviewer, if necessary.

🎯 Review Instructions

Look at it in one shot.

[dominiklohmann]

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Requesting a pull to tenzir:master from tenzir:topic/splunk-to-vast

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