Support for ephemeral resources

[marshallford]

Terraform CLI and Framework Versions

Terraform version: 1.10.3
Framework version: 1.13.0

Use Cases or Problem Statement

Allow provider authors to easily add a timeouts attribute to ephemeral resources. Ideally support both framework and SDKv2 providers (blocks and nested attributes).

Proposal

I'll create a PR to kick things off, but I'm open to feedback/help.

Additional Information

I noticed this feature was missing while working towards an ephemeral variant of an existing datasource (PR) which had a timeouts attribute.

Code of Conduct

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