build: add setup script for auto-install

[renejfc]

About

So, basically I reduced the friction of doing all the initial setup manually by adding a setup script that does everything needed by the app in order to run properly.

Current Status

The script per-se is working properly but fails at the last step when running bun ./src/static/mapper.ts, so the issue lays there.

• [x] Creates temp setup folder.
• [x] Download server.jar and store it in in the temp folder.
• [x] Executes the server.jar with Java to generate folders.
• [x] Copies blocks.json registries.json to static dir.
• [ ] Deletes temp setup folder (deactivated until fixing issues)
• [ ] Generates files in src/db by running bun ./src/static/mapper.ts (fails here)

Note

Please feel free to give me feedback. If there's something wrong on the script or I'm skipping something, please let me know and I'll fix it :)

If everything is in order then this should be merge-ready

[peacefulotter]

Thank you for this! I will try to have a look at the error you're encountering asap, probably next week, sorry for the delay