Upgradability In GRPC and Iroh endpoints

[JesseAbram]

Come up with a plan and implement for upgrades in both the GRPC and the Iroh layer

[JesseAbram]

GRPC

• labeling things as v1 for now and putting the proto into V1 folders

Iroh

• Relayer add an extra communication round to get the current highest version for each node, select the highest version
• Add version to session init

[JesseAbram]

Using the bulletin to coordinate this is great. This is global to a bulletin not local to a ring as one node can participate in many rings. The owner of the bulletin deployment should own the upgrade path