This PR creates a new ChangePasswordComponent. The first use-case of the ChangePasswordComponent is to place it inside a new PasswordSettingsComponent, which is accessed by going to Account Settings > Security.
The ChangePasswordComponent will be updated in future PRs to handle more change password scenarios.
Feature Flags: PM16117_ChangeExistingPasswordRefactor
Updates the InputPasswordComponent so that it can eventually be used in multiple set/change password scenarios.
Most importantly, this PR adds an InputPasswordFlow enum and @Input so that parent components can dictate which UI elements to show.
