[PM-3609] [Tech-Debt] Add types to password and username generator (#6090)

* Create and use GeneratorOptions

Selection between `password`and `username`

* Use PasswordGeneratorOptions

* Declare and use UsernameGeneratorOptions

libs/common/src/tools/generator/generator-options.ts

@@ -0,0 +1,3 @@
+export type GeneratorOptions = {
+  type?: "password" | "username";
+};