Add preset for climbing=area

[harahu]

Description, Motivation & Context

This PR is part of a larger effort to add support for rock climbing related features to iD. In this PR we add a preset for a climbing "area", which is understood to be a grouping of distinct crags that in the immediate vicinity of each other. Often an area will be delimited by a climbing guide book, where the OSM area will correspond to the area covered by the book. This might seem arbitrary, but never the less it matches closely with how climbers think about and use climbing related geodata in practice. Climbing areas are currently in active use by data consumers, e.g. openclimbing.org.

Climbing areas can be equipped with additional fields, in addition to a name. Usually this would be tags representing summary statistics for the routes and crags contained within the area. I've consciously decided to leave such fields out of this PR, since in practice all this information can be computed from the member objects. If it is decided at a later point that we want to encourage such tagging, we can always expand the preset then.

I've set up a Wikibase entry and a corresponding article for climbing areas, which can be found here:
https://wiki.openstreetmap.org/wiki/Item:Q23045
https://wiki.openstreetmap.org/wiki/Tag:climbing%3Darea

Related issues

• Presets for climbing features #31

Links and data

Relevant OSM Wiki links:

• Climbing areas

Relevant tag usage stats:
https://taginfo.openstreetmap.org/tags/climbing=area
https://taghistory.raifer.tech/#***/climbing/area

677 current uses

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## Test-Documentation

### Preview links & Sidebar Screenshots

<!-- Use the preview to find examples, select the feature in question and **copy this link here**.
     Find examples of nodes/areas. Find examples with a lot of tags or very few tags. – Whatever helps to test this thoroughly.
     Add relevant **screenshots** of the sidebar of those examples. -->

<!-- FYI: What we will check:
     - Is the [icon](https://github.com/ideditor/schema-builder/blob/main/ICONS.md) well chosen.
     - Are the fields well-structured and have good labels.
     - Do the dropdowns (etc.) work well and show helpful data. -->

### Search

<!-- **Test the search** of your preset and share relevant **screenshots** here.
     - Test the preset name as search terms.
     - Also test the preset terms and aliases as search terms (if present). -->

### Info-`i`

<!-- **Test the info-i** for your fields and preset and share relevant **screenshots** here.
     The info needs to help mappers understand the preset and when to use it.
     [Learn more…](https://github.com/openstreetmap/id-tagging-schema/blob/main/CONTRIBUTING.md#info-i)
 -->

### Wording

- [ ] American English
- [ ] `name`, `aliases` (if present) use Title Case
- [ ] `terms` (if present) use lower case, sorted A-Z
<!-- Learn more in https://github.com/openstreetmap/id-tagging-schema/blob/main/GUIDELINES.md#2-design-the-preset -->

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[harahu]

Test-Documentation

Preview links & Sidebar Screenshots

https://pr-1596--ideditor-presets-preview.netlify.app/id/dist/#locale=en&map=18.03/59.90399/5.91897&disable_features=boundaries&background=geovekst-nib&id=r19136912

Search

Info-i

Wording

• American English
• name, aliases (if present) use Title Case
• terms (if present) use lower case, sorted A-Z