Add possibility to create a contact while a new POI being created

[MizukiTemma]

Short description

This PR makes it possible to create a contact while a new POI is being created (before the initial save)

Proposed changes

• Render contact form as static form (not ajax)
• Add the newly created POI to the contact form and save

Side effects

• I hope none 🙈
• Currenlty only one contact can be created at the same time with a new POI. I guess it's but enough, as this feature is primarily needed for the primary contact.

Resolved issues

Fixes: #3322

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