move sdk out to its own module.

justfile

@@ -4,8 +4,6 @@ build-all:
         echo "building $dir"
         go build "./$dir"
     end
-    echo "building sdk"
-    go build ./sdk
 
 test-all:
     #!/usr/bin/env fish
@@ -13,5 +11,3 @@ test-all:
         echo "testing $dir"
         go test "./$dir"
     end
-    echo "testing sdk"
-    go test ./sdk