Adding new APIs to explorer worker

1. Download the full Cloudflare OpenAPI Spec from https://github.com/cloudflare/api-schemas.
2. Add the new API to miniflare/scripts/openapi-filter-config.ts.
3. Run OPENAPI_INPUT_PATH=<path> pnpm generate:api to filter and generate types. Confirm the filtered API is as expected, and add ignores to openapi-filter-config.ts if necessary.
4. The explorer should have access to all user resource bindings. This is done by adding proxyBindings to the explorer worker in getGlobalServices() in the core plugin. You may also have to add entries to CoreBindings.JSON_LOCAL_EXPLORER_BINDING_MAP if you need to access resource config such as IDs or database names which aren't available at runtime on the binding itself.
5. Implement the APIs in miniflare/src/workers/local-explorer/ using these bindings. You will have to register the routes in explorer.worker.ts and add handlers in /local-explorer/resources/.
6. Add tests for your API endpoint in miniflare/tests/plugins/local-explorer/.
7. Regenerate the UI's API client by running pnpm build in packages/local-explorer-ui.
8. Make any UI changes using your new API. The built output of the UI will be bundled into Miniflare when Miniflare is built.