Vellum-ai

wSDK:
- Change how nodes model their definition and base class throughout serialization and codegen
- Improve reliability of node id detection
API Clients:
- Introduce internal endpoints for fetching identity information for Workspaces and Organizations

- The `vellum pull` and `vellum push` command now supports custom image name specifications.

- Function call, audio, image prompt blocks are now supported in block compilation
- Nodes in nested workflows referencing outer nodes can now be serialized
- Subworkflow Nodes can now declare its inputs as attributes
- The `vellum workflows push` command now supports the `--dry-run` option.
- Generic nodes now properly serialize their triggers

- Fixes a Graph Generation issue related to multiple branches from the same node.
- Add support for custom container image and tag to push/pull.
- APIs used in Workflow SDKs are now ready for production usage.
- Adds support for a `dry_run` request body option to the /workflows/push endpoint.

- Fixes pydantic validation for references nested within Fern-generated pydantic models

- wSDK:
- Setup implementation and tests for node mocking