chore: generate countries.tsx from Go code (#15274)

Closes https://github.com/coder/coder/issues/15074

We have a hard-coded list of countries at
https://github.com/coder/coder/blob/main/site/src/pages/SetupPage/countries.tsx.
This means Go code in coder/coder doesn't have an easy way of utilizing
it.

## Solution
Generate countries.tsx from Go code. Generated by `scripts/apitypings`

scripts/typegen/rbacobject.gotmpl

@@ -0,0 +1,39 @@
+// Code generated by typegen/main.go. DO NOT EDIT.
+package rbac
+
+import "github.com/coder/coder/v2/coderd/rbac/policy"
+
+// Objecter returns the RBAC object for itself.
+type Objecter interface {
+	RBACObject() Object
+}
+
+var (
+	{{- range $element := . }}
+		{{- $Name := pascalCaseName $element.FunctionName }}
+		// Resource{{ $Name }}
+		// Valid Actions
+		{{- range $action, $value := .Actions }}
+		//  - "{{ actionEnum $action }}" :: {{ $value.Description }}
+		{{- end }}
+		Resource{{ $Name }} = Object {
+			Type: "{{ $element.Type }}",
+		}
+	{{ end -}}
+)
+
+func AllResources() []Objecter {
+	return []Objecter{
+	{{- range $element := . }}
+		Resource{{ pascalCaseName $element.FunctionName }},
+	{{- end }}
+	}
+}
+
+func AllActions() []policy.Action {
+	return []policy.Action {
+		{{- range $element := actionsList }}
+			policy.{{ $element.Enum }},
+		{{- end }}
+	}
+}