PLAT-7450 Add singlestoredb_team resource and datasource

[oyeliseiev-ua]

Manual testing:

• Create: name/description/with users/with teams members
• Update: add/remove user member, add/remove team member

[Copilot]

Pull Request Overview

This PR introduces a new SingleStoreDB teams resource and related data sources with full CRUD support, additional utility functions, tests, and documentation updates.

• Adds team-related functions in utility and converters packages.
• Implements the team resource and data source (get and list) along with corresponding test cases.
• Updates provider registration, examples, and docs for teams.

Reviewed Changes

Copilot reviewed 14 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
internal/provider/util/util.go	Added SubtractListValues helper function.
internal/provider/util/converters.go	Added ParseUUIDList function to convert string slices to UUID slices.
internal/provider/testutil/updatableconfig.go	Added team resource and datasource update helpers.
internal/provider/teams/resource_test.go	Added CRUD tests for teams; contains typos in variable names.
internal/provider/teams/resource.go	Introduces the team resource implementation and its helper functions.
internal/provider/teams/list_test.go	Adds tests for the teams list datasource; includes a header value bug.
internal/provider/teams/list.go	Teams list datasource implementation.
internal/provider/teams/get_test.go	Added tests for getting a single team resource.
internal/provider/teams/get.go	Implements the team get datasource.
internal/provider/provider.go	Registers the teams resource and datasources with the provider.
examples/embed.go	Adds team resource and datasource examples.
docs/resources/team.md	Documentation for the team resource (example contains spelling errors).
docs/data-sources/teams.md and docs/data-sources/team.md	Documentation for the team datasources.

Files not reviewed (3)

• examples/data-sources/singlestoredb_team/data-source.tf: Language not supported
• examples/data-sources/singlestoredb_teams/data-source.tf: Language not supported
• examples/resources/singlestoredb_team/resource.tf: Language not supported

[noprysk-ua]

Good job!