feat(py-sdk): add cli version to ingestion headers

[githendrik]

This PR aims to add the CLI version to the http headers when ingesting. We run a distributed setup for ingesting various data sources. To keep an eye on our ecosystem, we would like to correlate ingestion-users and their current cli versions, to inform them to update when we roll out a new version of datahub.

Let me know if this makes sense to you, or if we should find an alternative solution :-) Thanks!

Checklist

• [x] The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• [x] Links to related issues (if applicable)
• [x] Tests for the changes have been added/updated (if applicable)
• [x] Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• [x] For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub