Vellum-ai

- Adds support for chat history output types in code nodes
- Adds support for union output types of dataclasses in Code Execution nodes
- Updates code generation to write empty list for chat history messages if empty instead of nothing
- Introduce trace id for ExecutionContext
- Use the same run logic from Inline Prompt nodes on Prompt Deployment nodes
- Adds support for getting unused edges in a workflow

- Adds `unused_graphs` attribute to capture non-graph nodes and edges from the Vellum UI
- Fixes import path of code generation for BaseNode
- Skips code generating Node trigger classes when merge behavior is the default
- Adds support for the `settings` attribute on `InlinePromptNode`
- Supplements `undefined` class to show better error messages when interacting with it
- Fixes a Code Generation failure when the Sandbox inputs include a FunctionCall value
- Cleans up escape characters for quotes before processing chat message values during code generation

- Makes code generation more resilient to invalid node output data from the UI.
- Fixes internal error that was raised when a Templating node had an output type as a list of dataclasses.
- Supports the code generation of nodes not in the graph.
- Fixes the use of Jinja globals within Jinja block prompt compilation.
- Deprecates `WorkflowOutputDisplayOverrides`, `WorkflowOutputVellumDisplay` and `WorkflowOutputVellumDisplayOverrides` in favor of `WorkflowOutputDisplay`.

- Supports raising runtime errors in Code Execution Nodes as a user errors instead of a system error
- No longer code generates redundant Outputs classes for Inline Subworkflow and Map Nodes
- Fixes invalid references in Inline Subworkflow and Map Node Output Displays
- Supports code generation of Workflow Outputs that point to non-node outputs
- Adds a custom `replace` Jinja filter to better handle non-string values
- Time to first byte should improve dramatically for Workflows with Map and Subworkflow Nodes
- Fixes a bug where Code Execution Nodes failed to handle array inputs

- Fixes a bug on `vellum workflows push` for Workflows that utilize `LazyReference`s
- Properly genererates code for optional input and output variables using `typing.Optional`
- Supports serialization for both State variables and State references
- Adds better error handling for empty input on jinja templating

- [BREAKING] Renames our `UNDEF` singleton to `undefined` for future consistency with TypeScript SDKs.
- Fixes use of `cancel_signal` for Workflow executions that don't need to cancel.
- Node classes now auto-inherit from it's inherited node class' Outputs classes avoiding the need to manually inherit.
- Support 'contains' and 'does not contains' expressions now support WorkflowError as a valid operand.
- Fixes hanging experienced by map nodes when given an empty `items` list.
- Workflow classes now auto-inherit from it's inherited Workflow class' Outputs classes avoiding the need to manually inherit.
- Supports string indexing in inline code execution nodes for attribute access
- Avoids the code generation of authorization type if not provided from API Node
- Fixes a bug during sandbox code generation that would fail if there was a null string input present
- Fixes a bug during inline code execution nodes for NUMBER output types