docs: publish provider_meta design decision

[jar-b]

Description

This document will be a user-facing record for why the user_agent argument in provider_meta is a list of strings.

Relations

Relates #45464
Relates hashicorp/terraform-provider-awscc#474

[github-actions]

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[ewbankkit]

LGTM 🚀.

[github-actions]

Warning

This Issue has been closed, meaning that any additional comments are much easier for the maintainers to miss. Please assume that the maintainers will not see them.

Ongoing conversations amongst community members are welcome, however, the issue will be locked after 30 days. Moving conversations to another venue, such as the AWS Provider forum, is recommended. If you have additional concerns, please open a new issue, referencing this one where needed.

[github-actions]

This functionality has been released in v6.26.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!