feat: Add "coder" CLI (#221)

* feat: Add "coder" CLI

* Add CLI test for login

* Add "bin/coder" target to Makefile

* Update promptui to fix race

* Fix error scope

* Don't run CLI tests on Windows

* Fix requested changes

.vscode/settings.json

@@ -31,16 +31,22 @@
     "drpcconn",
     "drpcmux",
     "drpcserver",
+    "fatih",
     "goleak",
     "hashicorp",
     "httpmw",
+    "isatty",
     "Jobf",
+    "kirsle",
+    "manifoldco",
+    "mattn",
     "moby",
     "nhooyr",
     "nolint",
     "nosec",
     "oneof",
     "parameterscopeid",
+    "promptui",
     "protobuf",
     "provisionerd",
     "provisionersdk",