feat: workspace quotas (#4184)

coderd/workspacequota/workspacequota.go

@@ -0,0 +1,19 @@
+package workspacequota
+
+type Enforcer interface {
+	UserWorkspaceLimit() int
+	CanCreateWorkspace(count int) bool
+}
+
+type nop struct{}
+
+func NewNop() Enforcer {
+	return &nop{}
+}
+
+func (*nop) UserWorkspaceLimit() int {
+	return 0
+}
+func (*nop) CanCreateWorkspace(_ int) bool {
+	return true
+}