feat: add command to show version (#604)

* feat: add -version flag for jetkvm_app

* move code to kvm package

.golangci.yml

@@ -23,6 +23,9 @@ linters:
       - linters:
           - errcheck
         path: _test.go
+      - linters:
+          - forbidigo
+        path: cmd/main.go
       - linters:
           - gochecknoinits
         path: internal/logging/sse.go