Initial start on a Connect RPC backend server

This is the initial version of a Connect RPC backend server written in
Go.

At the moment it doesn't support any sort of authentication, that's TBD.

```
curl http://localhost:8080/algobowl.user.v1.UserService/GetUserInfo --header 'Content-Type: application/json' --data '{"username": "jrosenth"}'
{"user":{"id":"28263","username":"jrosenth","email":"jack@rosenth.al","displayName":"Jack
Rosenthal","isAdmin":true}}
```

Author: jackrosenthal

buf.gen.yaml

@@ -0,0 +1,15 @@
+version: v2
+managed:
+  enabled: true
+  override:
+    - file_option: go_package_prefix
+      value: github.com/jackrosenthal/algobowl/gen
+plugins:
+  - remote: buf.build/protocolbuffers/go:v1.36.6
+    out: gen
+    opt:
+      - paths=source_relative
+  - remote: buf.build/connectrpc/go:v1.18.1
+    out: gen
+    opt:
+      - paths=source_relative

buf.yaml

@@ -0,0 +1,10 @@
+# For details on buf.yaml configuration, visit https://buf.build/docs/configuration/v2/buf-yaml
+version: v2
+lint:
+  use:
+    - STANDARD
+breaking:
+  use:
+    - FILE
+modules:
+  - path: proto