slim world map representation and add gzip middleware

[timcowlishaw]

Only send the fields we need to render the world map. We also add Rack::Deflate middleware to gzip all json responses.

Partially addresses: fablabbcn/smartcitizen-web#451 (comment)

Overall, this cuts the weight of the world map from ~4.5MB to ~250k, and the response time down to approx 1.5 sec.

The speed up from caching the /world_map endpoint is now negligible, so we might think about removing that once we've verified that this all works correctly.

[timcowlishaw]

Deployed to staging on branch staging-2024-10-10

[oscgonfer]

Hi @timcowlishaw I was just testing this, and I think we can remove the owner from the world_map response.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ActionView::Template::Error: wrong number of arguments (given 1, expected 0) V0::DevicesController#world_map View Issue
• ‼️ **Rack::Timeout::RequestTimeoutException: Request ran for longer than 20000ms ** V0::DevicesController#show View Issue
• ‼️ **Rack::Timeout::RequestTimeoutException: Request ran for longer than 20000ms ** V0::UsersController#index View Issue

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