[openstreetmap/openstreetmap-website] Add support for rate limiting signup requests (PR #4198)

[Tom Hughes]

This PR attempts to add support for rate limiting signups from a given IP address and/or email address.

Obviously we only allow one account per email address but this works on the basis of a canonical address where any `+` extension is removed, and dots are stripped from the local part for gmail.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4198

-- Commit Summary --

  * Add support for rate limiting signup requests

-- File Changes --

    M app/controllers/users_controller.rb (25)
    A config/initializers/rate_limits.rb (15)
    M config/settings.yml (5)
    A lib/rate_limiter.rb (38)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4198.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4198.diff

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