Missing common.proto and trace.proto

[XiangFrank]

Describe the bug
In the pkg/tempopb/tempo.proto file, it import common.proto and trace.proto, these two files are supposed to be under /pkg/tempopb/common/v1 and /pkg/tempopb/trace/v1, but they are missing.

I suppose they should be the same to the OpenTelemetry proto common.proto and trace.proto, but still wanna confirm it and possibly add them back to avoid confusion.

To Reproduce
Steps to reproduce the behavior:

1. Start Tempo (SHA or version)
2. Perform Operations (Read/Write/Others)

Expected behavior

Environment:

• Infrastructure: [e.g., Kubernetes, bare-metal, laptop]
• Deployment tool: [e.g., helm, jsonnet]

Additional Context

[joe-elliott]

Yup. We have a somewhat convoluted process to generate proto in the repo. Run make gen-proto from the root to create those files.