[feature] Add API endpoint for indoor map coordinates #828

[dee077]

Implemented API to return device coordinates for a given location ID.

Fixes #828

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Closes #828

Description of Changes

• Added endpoint floorplan_coordinates_list to list coordinates
• Created a new serializer to add this below fields

fields = [
    "name", 
    "mac_address",
     "is_deactivated",
     "model",
     "os",
     "floor_name",
     "floor",
     "image",
     "location",
]

• Added filter by floor
• Added pagination class
• Added test

[coveralls]

coverage: 98.888% (-0.01%) from 98.899%
when pulling 1754156 on dee077:feature/828-api-indoor-map-coordinates
into 129a42f on openwisp:master.

[nemesifier]

@dee077 Isn't this part of the GSoC project idea for the indoor map?

[dee077]

Yes, this aligns with the GSoC project idea for the indoor map. However, at the time, it didn’t have the gsoc-idea label, so I wasn’t aware that it would be proposed as a GSoC idea for 2025.

[nemesifier]

The output looks very similar to GeoJSON, but it's not.
Good progress @dee077 👏

Look at where we use GeoJSON (rest_framework_gis): https://github.com/search?q=repo%3Aopenwisp%2Fopenwisp-controller%20rest_framework_gis&type=code.

Let's paginate the results and ensure the frontend can load paginated results gradually without crashing if there's many floorplan points scattered on many floors.