Add Password policy settings
Requests have been received from community gitlab#16555 and [JH customers](https://jihulab.com/gitlab-cn/gitlab/-/issues/450) about improving the password complexity. The current version of GitLab only have a password length setting on dashboard, it will be great to make the password requirements more flexible and configurable, and this feature should be only available for Premium and Ultimate plans
Duplicates https://gitlab.com/gitlab-org/gitlab/-/issues/348484
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### Proposal
The following configuration fields should be added under the Sign-up restrictions on General Settings page.
* Minimum password complexity
* Password expiration time
### UI
| before | after |
| ------ | ------ |
|  |  |
| before | after | Validation from PW creation |
| ------ | ------ | ------ |
|  |  |  |
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