extended fields to caravan_site

[paulklie]

Description, Motivation & Context

There are alot of fields for tourism=camp_site that can be expanded to caravan_sites

Links and data

Relevant tag usage stats:
Usage on caravan_site:

• tents: 12.53%
• toilets: 11.98%
• opening_hours: 7.8%
• picnic_table: 0.9%
• shower: 5.45%
• dog: 6.05%
• drinking_water: 4.55%

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## Test-Documentation

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- [ ] `name`, `aliases` (if present) use Title Case
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[paulklie]

Test-Documentation

Preview links & Sidebar Screenshots