feat: add resource for teams

[mitchnielsen]

Summary

Adds a resource for teams.

Related to https://linear.app/prefect/issue/PLA-352/add-support-for-teams

Related to #265

Team member access will be addressed in a separate resource (#397).

Requirements

General

• The contributing guide has been read
• Title follows the conventional commits format
• Body includes Closes <issue>, if available
• Relevant labels have been added
• Draft status is used until ready for review

Code-level changes

• Unit tests are added/updated
• Acceptance tests are added/updated (including import tests, when needed)

New or updated resource/datasource

• Documentation is added (generated by make docs from source code)
  - When applicable, provide a link back to the relevant page in the Prefect documentation site.
• For resources, the following are added:
  - Resource example under examples/resources/prefect_<name>/resource.tf
  - Import example under examples/resources/prefect_<name>/import.sh
• For datasources, the following is added:
  - Datasource example under examples/data-sources,resources>/prefect_<name>/data-source.tf