Add physicalType to NodeKey struct (#363)

## Summary

Based on Slack
[discussion](https://zipline-2kh4520.slack.com/archives/C0880ECQ0EN/p1739304132253249)

## Checklist
- [ ] Added Unit Tests
- [ ] Covered by existing CI
- [ ] Integration tested
- [ ] Documentation update


<!-- av pr metadata
This information is embedded by the av CLI when creating PRs to track
the status of stacks when using Aviator. Please do not delete or edit
this section of the PR.
```
{"parent":"main","parentHead":"","trunk":"main"}
```
-->


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced an optional attribute to enhance node classification with
more detailed physical characteristics for improved metadata
representation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Sean Lynch <[email protected]>

Author: sean-zlai

api/thrift/orchestration.thrift

@@ -42,6 +42,7 @@ struct NodeKey {
     1: optional string name
 
     2: optional LogicalType logicalType
+    3: optional PhysicalNodeType physicalType
 
     /**
     * represents the computation of the node including the computation of all its parents