feat: create and update trees

[choffmann]

Close #65
Close #74

Test with backend green-ecolution/green-ecolution-backend#106

[doriengr]

🔥

[doriengr]

There is something confusing to me:

1. I select a location on the map for a new tree
2. I am navigated to the form
3. I want to change the location
4. The latitude and longitude that I selected before are not shown in the SelectModal
5. When I click on »Zurück« I am not navigated back to the form, but I am navigated back to the map.

[doriengr]

Edit-View:
The save button is disabled even tho I have every field that is required filled with content.
I have to click inside the description field before I can save.

[choffmann]

There is something confusing to me:

1. I select a location on the map for a new tree
2. I am navigated to the form
3. I want to change the location
4. The latitude and longitude that I selected before are not shown in the SelectModal
5. When I click on »Zurück« I am not navigated back to the form, but I am navigated back to the map.

Whops, wrong redirect

[doriengr]

🔥