[destination-astra] Add user-agent with caller name

[hemidactylus]

What

This PR adds a custom user-agent header field to the Astra DB Data API requests for aggregate usage statistics on the API side.

How

A new header is added in the AstraClient class, later used when issuing API command HTTP POST requests.

Review guide

destination_astra/astra_client.py

User Impact

No impact.

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 26, 2024 6:01pm

[marcosmarxm]

@hemidactylus can you bump the metadata version and add an entry in the changelog doc?

[hemidactylus]

Hello, @marcosmarxm , I have bumped the connector version.
I also created a new airbyte-integrations/connectors/destination-astra/CHANGELOG.md with just the entry for this version (could not successfully investigate for the past changes in the commit history). I created it there after finding analogous files in some of the other connectors (e.g. airbyte-integrations/connectors/source-paypal-transaction/CHANGELOG.md), please let me know if this is what you meant.

Thank you!

[marcosmarxm]

Remove the changelog. You need to change the entry in the doc/integrations/destiination-astra.md file.

[marcosmarxm]

/format-fix

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