Refactor gRPC definitions into seperate repo

The protobuf files and the generated golang code has been moved into
git.ohea.xyz/cursorius/pipeline-api. The generated code is now imported
from that location. The version of the API has also been bumped to v2 to
avoid unsupported v1 modules in golang.

go.mod

@@ -3,6 +3,7 @@ module git.ohea.xyz/cursorius/server
 go 1.19
 
 require (
+	git.ohea.xyz/cursorius/pipeline-api/go/api/v2 v2.0.0-20230102084147-6d988866458e
 	git.ohea.xyz/golang/config v0.0.0-20220915224621-b9debd233173
 	github.com/bufbuild/connect-go v1.4.1
 	github.com/docker/docker v20.10.22+incompatible
@@ -11,7 +12,6 @@ require (
 	github.com/google/uuid v1.3.0
 	github.com/op/go-logging v0.0.0-20160315200505-970db520ece7
 	golang.org/x/net v0.2.0
-	google.golang.org/protobuf v1.28.1
 	nhooyr.io/websocket v1.8.7
 )
 
@@ -50,6 +50,7 @@ require (
 	golang.org/x/sys v0.2.0 // indirect
 	golang.org/x/text v0.4.0 // indirect
 	golang.org/x/tools v0.1.12 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	gotest.tools/v3 v3.4.0 // indirect