Adds aws_organizations_accounts datasource

[agseijas]

Community Note

• Please vote on this pull request by adding a 👍 reaction to the original pull request comment to help the community and maintainers prioritize this request
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for pull request followers and do not help prioritize the request

Closes #14153

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSOrganizations_serial'
...
=== RUN   testAccDataSourceAwsOrganizationsAccounts_basic
--- PASS: testAccDataSourceAwsOrganizationsAccounts_basic (33.92s)
...
PASS

This PR is similar to this one but is a bit more complete and also has tags. We can convert it to single noun _account too, WDYT?

Also the acctest depends on the presence of an organization that has at least 1 account in the profile that runs it, but we can do as with other sibling tests and skip it.

[github-actions]

Welcome @agseijas 👋

It looks like this is your first Pull Request submission to the Terraform AWS Provider! If you haven’t already done so please make sure you have checked out our CONTRIBUTING guide and FAQ to make sure your contribution is adhering to best practice and has all the necessary elements in place for a successful approval.

Also take a look at our FAQ which details how we prioritize Pull Requests for inclusion.

Thanks again, and welcome to the community! 😃

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.