Add preset for natural arch

[jake-low]

Description, Motivation & Context

Adds a preset for natural arches, which applies the tag natural=arch.

Natural arches are found all over the world. The tag natural=arch is the preferred way to tag them on OSM, but many are instead tagged as boulders (natural=rock) or tourist attractions (tourism=attraction). I believe this is mainly due to mappers not knowing that there is a specific tag for arches. Adding a preset will help make this tag more discoverable.

Links and data

• natural=arch on the OSM Wiki
• natural=arch on TagInfo

Checklist and Test-Documentation Template

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Follow these steps to test your PR yourself and make it a lot easier and faster for maintainers to check and approve it.

This is how it works:

1. After you submit your PR, the system will create a preview and comment on your PR:

   🍱 You can preview the tagging presets of this pull request here.
   If this is your first contribution to this project, the preview will not happen right away but requires a click from one of the project members. We will do this ASAP.

2. Once the preview is ready, use it to test your changes.

3. Now copy the snippet below into a new comment and fill out the blanks.

4. Now your PR is ready to be reviewed.

## 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/tordans/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 -->

[github-actions]

🍱 You can preview the tagging presets of this pull request here.

[jake-low]

I tested my PR using the link above. It seems to be working except that the icon doesn't display. The referenced icon, temaki-natural_arch, is one I recently added to Temaki. It's been released in the latest version of Temaki (v5.10.0). I looked in id-tagging-schema's package.json but the icon set dependencies aren't listed there, so I have some more learning to do about how the icons are included in this project. I'll look into this more when I have a bit of time.

[riQQ]

Temaki is in iD's package.json:
https://github.com/openstreetmap/iD/blob/develop/package.json#L82

Permalink to current commit:
https://github.com/openstreetmap/iD/blob/a6a07221f547269fb988015fb5c3631261067523/package.json#L82

[tordans]

Could you share the "Checklist and Test-Documentation Template" please. This will make reviewing faster.