* WIP: Support Protobuf.Value in V2 IR
* chore(frontend): Convert to ts-proto for Protobuf.Value in PipelineSpec
* remove ValueType
* npm run format
* Add license for ts-proto-descriptors
* chore(frontend): Use protoc to compile IR to typescript definition
* feat(frontend): Convert PipelineSpec to Staticflow for V2 pipeline.
* address comment