Add PasswordExpirationSystem control module for password expiration feature

What does this MR do and why?

base on !1012 (merged)

For password expiration feature, We need two control methods:

• visible?: Controls whether the password expiration attributes field is visible.(include api, ui GET/UPDATE)

::Gitlab::PasswordExpirationSystem.visible?

• enabled?: Controls whether password expiration feature is enabled.(include expire password, notice via email)

::Gitlab::PasswordExpirationSystem.enabled?

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