[openstreetmap/openstreetmap-website] Designate regions where new accounts cannot add notes (Issue #6567)

[Pablo Brasero]

pablobm created an issue (openstreetmap/openstreetmap-website#6567)

### Problem

Split from https://github.com/openstreetmap/openstreetmap-website/issues/6512

Common sources of vandalism and spam include anonymous users or those with recently-created accounts.

Specifically regarding notes, the debate is still open as to whether anonymous accounts should be able to create notes at all. See https://community.openstreetmap.org/t/we-dont-need-anonymous-notes/105335

### Description

Implement the ability to designate regions where new accounts and anonymous users cannot make map edits or create notes.

### Detail

- Enable PostGIS (https://github.com/openstreetmap/operations/issues/1317)
- New section on the website: a CRUD interface, accessible by admins and moderators, where "Block Zones" can be drawn as a polygon.
    - A third-party library such as https://terradraw.io/ (compatible with MapLibre and Leaflet) can be used to ease implementation.
- When a note is created within the designated area, by an anonymous or recent user, the creation is denied and the user is shown a descriptive error message.
- No limit on note comments for now, as this appears to be less of an issue.

### Open questions
- [ ] How do we define a "recent" user?

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